Section A: Understanding OBD Test Essentials
This guide serves as your comprehensive reference to understanding the On-Board Diagnostic (OBD) test, a critical part of vehicle inspection and repair. Whether you’re prepping for a Car Diagnosis Quiz or need to troubleshoot OBD system issues, this information is vital. Consider this your essential resource, replacing the older “Smog Check OBDII Reference (Testability Issues),” previously known as Appendix J.
Key Takeaway: This document is your go-to guide for mastering the OBD test portion of vehicle inspections and diagnosing related problems.
Section B: Revision History – Tracking OBD Standards Evolution
| Number | Section | Description | Revision Date |
|---|---|---|---|
| 1.0 | N/A | Original. | 09/1/2015 |
| 2.0 | F | Added Section F: BAR-97 Vehicles of Interest. | 01/22/2016 |
| 2.1 | C, E | Incorporated Permanent Diagnostic Trouble Code (PDTC) standards and Section E: PDTC Vehicles of Interest. | 04/26/2019 |
| 3.0 | E | Converted to HTML format, updated table titles, and revised Chrysler, Dodge, etc., instructions in Table 6. | 09/8/2020 |
| 3.1 | D | Added 2020-2021 Ford Escape and Lincoln Corsair (non-hybrid). | 12/21/2020 |
| 3.2 | D | Added 2021 Ford Bronco Sport and 2020-2021 Ford E Series; Removed specific 2021 E/F models. | 05/21/2021 |
| 3.3 | D | Added 2021-2022 Ford E 350; Removed 2020-2021 Ford E Series listing. | 07/14/2021 |
| 3.4 | D | Updated guidance for 2020-2021 Ford Escape and Lincoln Corsair. | 09/8/2021 |
| 4.0 | N/A | Introduced modified software standards and updated formatting. | 09/10/2021 |
| 4.1 | D | Added 2021-2022 Ford E450. | 09/21/2021 |
| 4.2 | D | Revised guidelines for Ford Escape/Corsair, Bronco Sport, and Econoline E-Series (2020-2022). | 02/10/2022 |
| 4.3 | C, D | Clarified incomplete monitor allowances for 2007+ diesel (“Particulate Filter and NMHC”); Added exhaust gas/NOx sensor readiness issues. | 07/05/2023 |
| 4.4 | D, F | Updated Ford Escape, Bronco Sport, E350/450, F-650/750, Corsair (2020-2022); Added F-53/59 Motorhome/Chassis; Linked SSM 50974. | 09/11/2023 |
| 4.5 | D | Updated 2019 Chevrolet Express, 2014–2016 Dodge Ram ProMaster; Added GMC Savana recall. | 11/02/2023 |
| 4.6 | D | Updated 2015–2019 Ford Transit. | 11/08/2023 |
| 4.7 | D | Updated Chevrolet Express/Savana, Dodge Ram ProMaster, Ford Transit (various years). | 11/23/2023 |
| 4.8 | D | Updated Dodge/Ram 3500 and added 2500/3500 6.7L diesel (2010-2015). | 12/23/2023 |
| 4.9 | E | Expanded PDTC vehicle list: Chrysler 200/300/Pacifica/Town & Country; Dodge Avenger/Caliber/Challenger/Charger/etc.; Jeep Cherokee/Commander/etc.; Ram 1500/2500/3500/Promaster. | 01/24/2024 |
| 5.0 | D | Updated Jaguar/Land Rover (2017-2019) diesel models NOx aftertreatment issue. | 03/14/2024 |
| 6.0 | D | Added 2025+ Ford Explorer models & OBD Test bypass for OBDonUDS vehicles. | 09/21/2024 |
| 7.0 | D | Edited 2015–2019 Ford Transit (diesel); Added 2013-2016 Ford F Series Super Duty 6.7L (diesel). Exhaust Gas Sensor readiness bypass. | 10/05/2024 |
Revision History Significance: Understanding the revision history is crucial for anyone taking a car diagnosis quiz focused on emissions testing. It highlights how OBD standards and testing procedures evolve, impacting vehicle diagnostics and smog check requirements.
Section C: OBD Test Pass/Fail Criteria for Smog Check
This section details the pass/fail standards for the OBD test during a Smog Check inspection. Knowing these standards is fundamental for passing any car diagnosis quiz related to vehicle emissions and OBD systems.
Readiness Monitor Standards: Are You Ready to Test Your Knowledge?
Readiness monitors are self-diagnostic tests performed by a vehicle’s OBD system to confirm the correct operation of emission control systems. Most vehicles complete these monitors during normal driving. However, some vehicles require specific driving conditions or may have underlying issues preventing monitor completion. Vehicle owner’s manuals sometimes include drive cycle procedures to complete monitors, but this information is often found in OEM or repair industry literature.
Important Note: Monitor completion depends on proper component function. A vehicle might not complete a monitor until diagnostic and repair work is done on the enabling components. Monitors also reset after repairs like battery disconnection or emission component replacement.
Incomplete Monitor Allowance: The table below outlines the number of incomplete readiness monitors permitted to pass the OBD test portion of a Smog Check. Test your understanding: Can you recall these allowances for a quick car diagnosis quiz?
| Model Year | Fuel Type | Incomplete Monitors Allowed |
|---|---|---|
| 1996-1999 | Gas² | Any one³ |
| 2000 and newer | Gas² | Evaporative system³ |
| 1998-2006 | Diesel | Zero |
| 2007 and newer | Diesel | Particulate Filter & NMHC⁴ |
¹ Implemented May 4, 2015.
² “Gas” includes gasoline, propane, natural gas (CNG, LNG, LPG).
³ Misfire, fuel, and comprehensive component continuous monitors are ignored on “gas” vehicles.
⁴ Implemented July 5, 2023.
Malfunction Indicator Lamp (MIL) Standards: The Check Engine Light Challenge
The Malfunction Indicator Lamp (MIL), or “Check Engine” light, is a key indicator in OBD testing. Understanding MIL behavior is crucial for any car diagnosis quiz focusing on fault detection. Here are the MIL pass/fail standards for BAR-97 and OIS inspections:
| Condition | Pass/Fail | Standard |
|---|---|---|
| Key On Engine Off (KOEO) | Pass | MIL illuminates |
| Engine Running (KOER) | Pass | MIL turns off |
| Key On Engine Off (KOEO) | Fail | MIL does not illuminate |
| Engine Running (KOER) | Fail | MIL illuminates |
MIL Diagnostic Tip: A failing MIL indication often points to electrical issues, bulb problems, or serious engine management faults.
Communication Standards: Are You Speaking the Right Language?
Communication issues can cause OBD test failures. Reasons range from connector damage and wiring problems to aftermarket stereos interfering with the system. Communication protocols are a frequent topic in car diagnosis quizzes.
OBD Communication Standards for BAR-97 and OIS Inspections:
| Inspection Type | Standard |
|---|---|
| BAR-97 | Vehicle communicates with BAR-97 analyzer |
| OIS | Vehicle communicates with OIS and transmits required data¹ |
¹ Required data typically includes OBD addresses: Mode $01 PID $00 (supported data) and Mode $01 PID $01 (MIL status, DTCs, monitor status).
Permanent Diagnostic Trouble Code (PDTC) Standards: The Codes That Won’t Quit
Permanent Diagnostic Trouble Codes (PDTCs) were added to BAR-OIS Smog Checks on July 1, 2019. PDTCs are like regular DTCs but cannot be cleared using a scan tool or by disconnecting the battery. They clear only when the OBD II system verifies the original fault is resolved. PDTCs are a more advanced topic, perfect for a challenging car diagnosis quiz.
PDTC Standards for OIS Inspections:
| Model Year | Inspection Type | Standard |
|---|---|---|
| 1996-1999 | BAR-97 | Not applicable |
| 2000-2009 | OIS | Not applicable |
| 2010 and newer ¹ | OIS | Fail if PDTC present ²,³,⁴,⁵ |
¹ Some 2010 vehicles may not support PDTC checks.
² PDTC presence fails the test regardless of MIL status.
³ PDTC check is ignored if the vehicle has completed 15+ warm-up cycles and 200+ miles since the last OBD data clear (Mode $01 PID $30 & $31).
⁴ BAR is aware of vehicles with PDTC clearing issues and is working with CARB. See Permanent Diagnostic Trouble Code Vehicles of Interest.
⁵ Manufacturers have issued warranties/recalls for PDTC issues. Refer motorists to dealers for covered repairs.
Modified Software Standards: Software Integrity Check
Since July 19, 2021, a modified software check is part of the BAR-OIS Smog Check. Software approved by CARB Executive Order should not cause a failure.
Modified Software Failure Standard: Vehicles with illegally modified software will fail. The inspection report will show “Modified Software.” To pass, the software must be restored to OEM or CARB-approved configuration, and retested. Consumers can dispute results with the Smog Check Referee at (800) 622-7733.
Section D: OIS Vehicles of Interest – Navigating Diagnostic Challenges
This section lists gasoline (2000+) and diesel (1998+) vehicles with known OBD test issues during OIS inspections. These issues include communication failures, incomplete monitors, OBD incompatibility, and false MIL indications. This detailed vehicle list is excellent material for a practical car diagnosis quiz, testing real-world troubleshooting knowledge.
| Make | Year | Model Engine (L); Fuel Type | Issue | Cause and Possible Remedy | Instruction to Inspector |
|---|---|---|---|---|---|
| Audi | 2000-2004 | A4 & A6 | No OBD communication; Transmission Control Module response only; ABS/brake lamp illuminated. | Broken ground wire in ABS module. Audi TSB #A45-15-10. | Repair and retest. |
| BMW | 6/1/99 – 7/31/00 | 323i Sedan | Oxygen sensor readiness monitor may not set. | DME Software error. TSB #SI B12 16 16. | Check DME number, follow TSB. |
| BMW | 9/3/99 – 7/31/00 | 323iT Touring | Oxygen sensor readiness monitor may not set. | DME Software error. TSB #SI B12 16 16. | Check DME number, follow TSB. |
| BMW | 6/1/99 – 7/29/00 | 323Ci Coupe | Oxygen sensor readiness monitor may not set. | DME Software error. TSB #SI B12 16 16. | Check DME number, follow TSB. |
| BMW | 6/23/99 – 7/29/00 | 323 Cic Convertible | Oxygen sensor readiness monitor may not set. | DME Software error. TSB #SI B12 16 16. | Check DME number, follow TSB. |
| BMW | 2000 | M52 (TU) engine | Oxygen sensor readiness monitor may not set. | DME Software error. TSB #SI B12 16 16. | Check DME number, follow TSB. |
| BMW | 2000 | Readiness failure; oxygen sensor monitor may not set. | ECM Software error. Recall #00E-A01, BMW bulletin #SI B 12 15 99. | Reflash ECM per recall. | |
| BMW | built 3/98 – 7/99 | 323i, 323iA, 328i, 328iA | Readiness failure; oxygen sensor monitor may not set. | ECM Software error. Recall #00E-A01, BMW bulletin #SI B 12 15 99. | Reflash ECM per recall. |
| BMW | built 2/99 – 7/99 | 328iC, 328iCA, 323iC, 323iCA, 528i, 528iA, 528iT, 528iAT | Readiness failure; oxygen sensor monitor may not set. | ECM Software error. Recall #00E-A01, BMW bulletin #SI B 12 15 99. | Reflash ECM per recall. |
| BMW | built 9/98 – 7/99 | Z3 roadster 2.3 | Readiness failure; oxygen sensor monitor may not set. | ECM Software error. Recall #00E-A01, BMW bulletin #SI B 12 15 99. | Reflash ECM per recall. |
| BMW | built 4/99 – 7/99 | Z3 roadster coupe/ roadster 2.8 | Readiness failure; oxygen sensor monitor may not set. | ECM Software error. Recall #00E-A01, BMW bulletin #SI B 12 15 99. | Reflash ECM per recall. |
| BMW | 2001-2003 | Z3 M Roadster/coupe with S54 engine | No communication when ignition off/on; BMW DIS/GT1 communication possible. | Recall Campaign, Bulletin #SI B12 11 06. | Follow OIS prompts, connect/disconnect DAD when key off. |
| BMW | 2000-2003 | Z8 & M5 with S62 engine | No communication when ignition off/on; BMW DIS/GT1 communication possible. | Recall Campaign, Bulletin #SI B12 11 06. | Follow OIS prompts, connect/disconnect DAD when key off. |
| BMW | From series intro. up to 8/27/2004 | M3 with S54 engine | No communication when ignition off/on; BMW DIS/GT1 communication possible. | Recall Campaign, Bulletin #SI B12 11 06. | Follow OIS prompts, connect/disconnect DAD when key off. |
| BMW | 2003 | M3 | EGR monitor failure. | Check thermostat. | Repair and retest. |
| BMW | 2007 | 328i | Engine dies during OBD Test, won’t restart. | Keyless ignition issue. | Separate key/vehicle, wait 20+ min, retest. |
| Chevrolet | 1998-2005 | DIESEL C/K2500 & C/K3500, G30, G3500, P30 | Federal diesel, not OBD-II certified (over 8,500 GVWR). | Not OBD-II or Fed OBD compliant. | Test normally, ignore continuous monitors, use bulb check result if no communication. |
| Chevrolet | 1999-2005 | 3500 W35042 (box truck) (diesel) | Not equipped with OBD II. | OBD not installed in federal vehicles. | OIS skips OBD functional test. |
| Chevrolet | 2000-2002 | S-10 (2WD), 2.2L I-4 (E85) | Monitors won’t set on flex fuel models (VINs listed). | Monitors disabled > E15/E10 blends. | OIS ignores all 11 readiness monitors. |
| Chevrolet | 2000-2005 | Suburban, Silverado, Express, Avalanche (gasoline) | “Unable to confirm OBD II requirements” message. | Federal certified, may not be OBD II certified. | Check emission label, enter result in OIS, may require BAR-97 test. |
| Chevrolet | 2001 | Silverado / Tahoe C/K 1500 | Secondary air system monitor failure. | Air injection problem. | Diagnose, repair, retest. |
| Chevrolet | 2002 | Silverado C/K 2500HD (diesel) | EGR monitor failure. | Difficult drive cycle. | OIS allows incomplete monitor (reprogrammed 10/13/2016). |
| Chevrolet | 2001-2002 | Cavalier CNG First VIN digit “3” (Mexico built) | CAT monitor failure. | Vehicle design anomaly. | OIS allows one incomplete monitor (reprogrammed 02/11/2015). |
| Chevrolet | 2019 | Express 2.8L (diesel) | Exhaust Gas Sensor monitor incomplete; PM sensor fault may not set DTC/MIL. | ECM diagnostic information issue. Recall N232408230. | Reflash ECM, retest. |
| Chrysler | 1999-2000 | Town & Country 3.0L (after 12/1/1998) | EGR Monitor incomplete at high altitude. | Reflash available. TSB 18-03-00. | Reflash, run monitors, retest. |
| Chrysler | 2000 | Town and Country 3.3L V-6 (E-85) | Readiness monitors won’t set on flex fuel models (VINs listed). | Monitors disabled >E30, ethanol learning. | OIS ignores all 11 readiness monitors. |
| Chrysler | 2003 | PT Cruiser 2.4L turbo, 5-spd manual | Catalyst monitor failure. | PCM software error. TSB #18-112-16, warranty D-16-26. | Reflash, repair, retest. |
| Chrysler | 2010 (before 2/20/2010) | 300, Charger, Challenger 3.5L | Monitor readiness failure, MIL: P0456, P0452, P1115. | Reflash available. TSB #18-008-10. | Reflash, repair, retest. |
| Dodge | 1998-2002 | Ram Truck 5.9L (Cummins diesel) | Continuous monitors may not complete. | Vehicle design anomaly. | Test normally, OIS allows one incomplete continuous monitor. |
| Dodge | 1998-2006 | Ram 2500, Ram 3500 (diesel) | Federal diesel, not OBD-II certified (over 8,500 GVWR). | Not OBD-II or Fed OBD compliant. | Test normally, ignore continuous monitors, use bulb check if no communication. |
| Dodge | 1999-2000 | Caravan 3.0L (after 12/1/1998) | EGR Monitor incomplete at high altitude. | Reflash available. TSB 18-03-00. | Reflash, run monitors, retest. |
| Dodge | 2003 | Dakota, Durango, Ram Trucks 4.7L | Catalyst monitor readiness “not supported”. | Broken vehicle, TSB #18-032-10, lifetime warranty. | Test normally, OIS ignores unsupported monitors. |
| Dodge | 2003 | Ram Truck 5.9L (Cummins diesel) | MIL commanded ON, light off, no DTCs. | Vehicle design anomaly. Recall #K01 (CA certified only). | Test normally, OIS ignores MIL command if no DTCs, advise Recall #K01 (CA). |
| Dodge | 2003-2004 | 2500 4X2, Sprinter 3500 4X2 (diesel) | Federal diesel, not OBD-II certified (over 8,500 GVWR). | Not OBD-II or Fed OBD compliant. | Test normally, ignore continuous monitors, use bulb check if no communication. |
| Dodge | 2004-2005 (after 12/7/2003) | Ram Truck 5.9L (Cummins diesel) | Comprehensive component monitor incomplete. | Vehicle design anomaly. TSB #18-030-10, lifetime warranty #18-003-11. | Test normally, OIS allows one incomplete monitor, advise lifetime warranty #18-003-11. |
| Dodge | 2004-2006 | 2500 3500 Sprinter (diesel) | EGR/VVT monitor incomplete. | ECU software error. | Test normally, OIS ignores EGR/VVT monitor. |
| Dodge | 2005 | Ram Truck 5.9L (Cummins diesel) | Misfire & Comprehensive Components monitors incomplete. | Vehicle design anomaly. | Test normally, OIS ignores misfire & comprehensive component monitor readiness. |
| Dodge | 2006-2007 | Ram Truck 5.9L, 6.7L (Cummins diesel) | Fuel System & Comprehensive Components monitors incomplete. | Recall #K01 (CA certified only). | Test normally, OIS ignores fuel & comprehensive component monitor readiness, advise Recall #K01 (CA). |
| Dodge | 2006-2007 | Ram Truck 5.9L (ETC/ETH after 1/1/06), Cab Chassis 6.7L (ETJ before 1/11/07) (Cummins diesel) | Fuel System & Comprehensive Components monitors incomplete. | TSB #18-017-10 (Federal certified only). | Test normally, OIS ignores fuel & comprehensive component monitor readiness, advise TSB #18-017-10 (Federal). |
| Dodge | 2010 (before 2/20/10) | 300, Charger, Challenger 3.5L | Evaporative monitor may not set. | Evaporative leak detection monitor issue. | Test normally, inform consumer TSB #18-008-10 Revision A. |
| Dodge/Ram | 2010-2015 | 2500 & 3500 6.7L (diesel) | NOx after-treatment monitor incomplete. | Vehicle design anomaly. | Test normally, OIS temporarily allows NOx monitor to be incomplete. |
| Dodge/Ram | 2014 | ProMaster 2500 & 3500 High 3.0L (diesel) | Exhaust Gas Sensor monitor incomplete. | Vehicle design anomaly. Recalls V97 & ZC0. | Reflash, perform recalls, retest. |
| Dodge/Ram | 2015 | ProMaster 1500, 2500, & 3500 High & Standard 3.0L (diesel) | Exhaust Gas Sensor monitor incomplete. | Vehicle design anomaly. Recalls V97 & ZC0. | Reflash, perform recalls, retest. |
| Dodge/Ram | 2016 | ProMaster 2500 & 3500 High 3.0L (diesel) | Exhaust Gas Sensor monitor incomplete. | Vehicle design anomaly. Recall V97. | Reflash, perform recall, retest. |
| Ford | 1998-2003 | Truck 7.3L (diesel) | Engine shut off when requesting Mode $09 data. | Vehicle design anomaly. | Test normally, OIS skips Mode $09 data request. |
| Ford | 1998-2004 | F250, F350, E350, E450, E Super Duty, Econo Commercial S- Duty, Econo RV S- Duty (diesel) | Federal diesel, not OBD-II certified (over 8,500 GVWR). | Not OBD-II or Fed OBD compliant. | Test normally, ignore continuous monitors, use bulb check if no communication. |
| Ford | 2000-2004 | F250, F350, E350, Excursion (gasoline) | “Unable to confirm OBD II requirements” message. | Federal certified, may not be OBD II certified. | Check emission label, enter type in OIS, may require BAR-97. |
| Ford | 2003 | Focus | Readiness failure. | Monitors difficult to complete. TSB #06-7-5. | Reflash PCM, test normally. |
| Ford | 2004 | E350 Super duty 5.4 (gas) | CAT monitor failure. | Vehicle design anomaly. Recall #15E06. | Reflash ECM, retest. |
| Ford | 2011 | Edge, Explorer 3.5L & 3.7L | Readiness failure. | OBD-II data clears on start, incorrect VIN. Recall #13E04. | Consult Recall #13E04, ensure recall done, monitors complete. |
| Ford | 2013-2016 | F series, Super Duty 6.7L (diesel) | Exhaust Gas Sensor monitor incomplete. | EGS monitor degreening strategy after DOC/DPF replacement (6-10k miles). | Test normally, OIS ignores EGS monitor (certain VINs, DOC/DPF replaced after 1/1/22, expires 10/8/25). |
| Ford | 2015-2019 | Transit 3.2L (diesel) | Exhaust Gas Sensor monitor incomplete. | EGS monitor degreening strategy after DOC/DPF replacement (6-10k miles). | Test normally, OIS ignores EGS monitor (certain VINs, DOC/DPF replaced after 1/1/22, expires 10/8/25). |
| Ford | 2020-2022 | Escape (gasoline & hybrid) | No communication with BAR-OIS. | Design issue, software update available. SSM 50974. | Test normally, direct to Ford dealer for software update if no communication. |
| Ford | 2021-2022 | Bronco Sport (gasoline) | No communication with BAR-OIS. | Design issue, software update available. SSM 50974. | Test normally, direct to Ford dealer for software update if no communication. |
| Ford | 2021-2023 | E350, E450 (gasoline) | No communication with BAR-OIS. | Design issue, software update available. SSM 50974. | Test normally, direct to Ford dealer for software update if no communication. |
| Ford | 2025 and newer | Explorer (2.3L) AWD, RWD | No OBD communication. | OBDonUDS. DAD 1.0 incompatible. | Cal-VIS skips OBD test (DAD 2.0 certification pending). |
| Freightliner | 1998-2004 | M Line Walk In Van (diesel) | Not equipped with OBD II. | OBD not required (federal certified, GVWR 6,001-14,000). | OIS skips OBD functional test. |
| Freightliner | 2004-2006 | Sprinter (diesel) | EGR/VVT monitor incomplete. | ECU software error. | Test normally, OIS ignores EGR/VVT monitor. |
| GM | 2000 – 2008 | Various models, Silverado 1500 | No vehicle voltage prompt. | No power on OBDII connector (DLC pin 16). | Use auxiliary DAD cables/power supply. |
| GM | 2015-2017 | All gasoline powered | Readiness failure. | Post catalyst oxygen sensor monitor break-in (1000 miles). Bulletin #15-NA-010. | Inspect after 1000 miles or send to Referee. |
| GMC | 1998-2005 | DIESEL C/K2500 & C/K 3500, Savana G3500, Workhorse P30 | Federal diesel, not OBD-II certified (over 8,500 GVWR). | Not OBD-II or Fed OBD compliant. | Test normally, ignore continuous monitors, use bulb check if no communication. |
| GMC | 1999-2005 | W3500 W35042 (box truck) (diesel) | Not equipped with OBD II. | OBD not required (federal certified, GVWR 10,001-14,000). | OIS skips OBD functional test. |
| GMC | 2000-2002 | Sonoma (2WD), 2.2L I-4 (E85) | Monitors won’t set on flex fuel models (VINs listed). | Monitors disabled > E15/E10 blends. | OIS ignores all 11 readiness monitors. |
| GMC | 2000-2005 | Sierra, Yukon, Savana (gasoline) | “Unable to confirm OBD II requirements” message. | Federal certified, may not be OBD II certified. | Check emission label, enter type in OIS, may require BAR-97. |
| GMC | 2002 | Sierra C/K 2500HD (diesel) | EGR monitor failure. | Difficult drive cycle. | OIS allows incomplete monitor (reprogrammed 10/13/2016). |
| GMC | 2019 | Savana 2.8L (diesel) | Exhaust Gas Sensor monitor incomplete; PM sensor fault may not set DTC/MIL. | ECM diagnostic information issue. Recall N232408230. | Reflash ECM, retest. |
| GMC | 2022 | Sierra K2500 SLT 6.6L (diesel) | Exhaust Gas Sensor monitor incomplete. | Vehicle design anomaly. | Test normally, OIS temporarily allows Exhaust Gas Sensor monitor incomplete. |
| Hyundai | 2002 | Sonata | Readiness failure. | Monitors difficult to complete. TSB #02-36-030. | Run drive cycle, see TSB #02-36-030. |
| Hyundai | 2003 | Tiburon | No communication with generic OBD. | Pin 5 not grounded. TSB, recall #057, TSB #03-01-003-01. | Test normally on OIS, ground pin 5 for generic OBD. |
| Infiniti | 2000 -2001 | I30 | Catalyst monitor failure. | OEM scan tool only shows OBD catalyst code. | Test catalyst, replace if defective. |
| Infiniti | 2000 -2001 | I30 | Readiness failure. | Monitors difficult to complete. | Run drive cycle. |
| Isuzu | 1998-2005 | NPR (diesel) | Not equipped with OBD II. | OBD not required (federal certified, GVWR 10,001-14,000). | OIS skips OBD functional test. |
| Isuzu | 2000-2002 | Hombre (2WD) 2.2L I-4 (E85) | Monitors wont set on flex fuel models (VINs listed). | Monitors disabled > E15/E10 blends. | OIS ignores all 11 readiness monitors. |
| Jaguar | 2017 | Jaguar XE, XF, & F-Pace 2.0L (diesel) | NOx Aftertreatment System monitor incomplete. | Vehicle design anomaly. Recall H444. | Test normally, direct to Jaguar dealer for software update. |
| Jaguar | 2018 | Jaguar XE, XF, F-Pace & Rover Velar 2.0L (diesel) | NOx Aftertreatment System monitor incomplete. | Vehicle design anomaly. Recall H444. | Test normally, direct to Jaguar dealer for software update. |
| Jaguar | 2019 | Jaguar XE, XF, & F-Pace 2.0L (diesel) | NOx Aftertreatment System monitor incomplete. | Vehicle design anomaly. Recall H444. | Test normally, direct to Jaguar dealer for software update. |
| Jeep | 2005-2006 | Wrangler | O2 sensor, O2 heater, catalyst readiness monitors may be not ready. | Vehicle design anomaly. TSB #25-005-13 Rev. A. | OIS allows incomplete O2 heater monitor. |
| Jeep | 2010-2011 | Wrangler 3.8L | Oxygen sensor monitor failure. | PCM monitor frequency issue. Recalls L34/L35, TSB 18-027-10, OEM drive cycle issue. | Reflash PCM, run special drive cycle. |
| Kia | 2009 | Borrego LX/EX 3.8L | Readiness failure. EGR monitor may not set. | EGR monitor completion difficult. | OIS allows incomplete EGR/VVT monitor (reprogrammed 12/7/2017). |
| Land Rover | 2017 | Discovery, Range Rover, Range Rover Sport 3.0L (diesel) | NOx Aftertreatment System monitor incomplete. | Vehicle design anomaly. Recall N808. | Test normally, direct to Land Rover dealer for software update. |
| Land Rover | 2018 | Velar 2.0L (diesel) | NOx Aftertreatment System monitor incomplete. | Vehicle design anomaly. Recall N808. | Test normally, direct to Land Rover dealer for software update. |
| Land Rover | 2019 | Velar 2.0L (diesel) | NOx Aftertreatment System monitor incomplete. | Vehicle design anomaly. Recall N808. | Test normally, direct to Land Rover dealer for software update. |
| Lexus | 2007 | RX400 Hybrid | Oxygen sensor (air/fuel) monitor readiness failure. | Air Fuel monitor issue. Lexus campaign FLD, TSB #L-SB-0027-15. | Advise recall may be required, check https://www.toyota.com/recall. |
| Lincoln | 2011 | MKX 3.5L & 3.7L | Readiness failure. | OBD-II data clears on start, incorrect VIN. Recall #13E04. | Consult Recall #13E04, ensure recall done, monitors complete. |
| Lincoln | 2020-2022 | Corsair (gasoline & hybrid) | No communication with BAR-OIS. | Design issue, software update available. SSM 50974. | Test normally, direct to Ford dealer for software update if no communication. |
| Mazda | 2000 | MPV | Catalyst monitor failure. | Catalyst/oxygen sensor issue. | Repair and retest. |
| Mazda | 2002-2003 | B3000 (2WD) 3.0L V-6 (E-85) | Readiness monitors won’t set on flex fuel models. | Monitors disabled >E10 blends. | OIS ignores all 11 readiness monitors. |
| Mazda | 2003-2004 | Mazda 6 | False MIL illumination, U-codes during OBDII test. | PCM sensitive to OBD tool connect/disconnect. Bulletin #01-002/05. | Reset monitors, connect/disconnect DAD key off. |
| Mazda | 2005 | Mazda 6 (2.3 only) | False MIL illumination, U-codes during OBDII test. | PCM sensitive to OBD tool connect/disconnect. Bulletin #01-002/05. | Reset monitors, connect/disconnect DAD key off. |
| Mazda | 2003-2005 | Mazda 6 – 2.3 non PZEV, 3.0 engine | False MIL illumination. | PCM sensitive to OBD tool connect/disconnect. TSB #01-024/05, Recall TSB #1303F. | Follow OIS prompts, connect/disconnect DAD key off. |
| Mitsubishi Fuso | 1998-2004 | FE639/FG639 (diesel) | Not equipped with OBDII. | OBD not required (federal certified, GVWR 10,001 –14,000). | OIS skips OBD functional test. |
| Mitsubishi | 2000-2001 | Montero, Montero Sport, Diamante, 3000GT Mirage, Galant, Expo/Expo LRV, Eclipse (except 2.0L non-turbo 420A) | Readiness failure. | Monitors difficult to complete. | Follow Mitsubishi service manual drive cycles. |
| Nissan | 1999-2007 | UD1200 (Diesel) | Not equipped with OBDII. | OBD not required (federal certified, GVWR 10,001-14,000). | OIS skips OBD functional test (reprogrammed 2/26/2016). |
| Nissan | 2000-2001 | Maxima | Catalyst monitor failure. | OEM scan tool only shows OBD catalyst code. | Test catalyst, replace if defective. |
| Nissan | 2000-2006 | All models | Readiness failure. | Incomplete monitors. | Follow drive cycle (year/make/model/engine/certification/transmission). |
| Plymouth | 1999-2000 | Voyager 3.0L (after 12/1/1998) | EGR Monitor incomplete at high altitude. | Reflash available. TSB 18-03-00. | Reflash, repair, retest. |
| Plymouth | 2000 | Voyager 3.3L V-6 (E-85) | Readiness monitors won’t set on flex fuel models (VINs listed). | Monitors disabled >E30, ethanol learning. | OIS ignores all 11 readiness monitors. |
| Suzuki | 2001 | Aerio | Readiness failure. | Monitors difficult to complete. | Follow drive cycle (OBD Clearinghouse/Suzuki service info). |
| Suzuki | 2004 | Forenza | Readiness failure. | Monitors difficult to complete. | Follow drive cycle (OBD Clearinghouse/Suzuki service info). |
| Toyota | 2000-2006 | All models | Readiness failure. | Monitors difficult to complete. | Follow Toyota service information drive cycles. |
| Toyota | 2003-2004 | 4 Runner | VSC light illuminates with aftermarket scan tool (CAN protocol). | Stability control calibration loss. | OIS avoids CAN protocol on these vehicles. |
| Toyota | 2007 | Highlander Hybrid | Oxygen sensor (air/fuel) monitor readiness failure. | Air Fuel monitor issue. Toyota campaign F0P, TSB #0042-15. | Advise recall may be required, check https://www.toyota.com/recall. |
| Volvo | 2000 | S40 / V40 | Comprehensive, Oxygen sensor, Catalyst monitor failure. | Defective ECM. | Send to Referee (if only these monitors unset), repair other failures first. |
| Volvo | 2004-2006 | S40, V50 | Air conditioning readiness monitor mistakenly supported. | Vehicle design anomaly. | OIS ignores A/C monitor status. |
| Volvo | 2005-2007 | XC90 | Air conditioning readiness monitor mistakenly supported. | Vehicle design anomaly. | OIS ignores A/C monitor status. |
| VW | 2000-2005 | Passat | No OBD communication; Transmission Control Module response only; ABS/brake lamp illuminated. | Broken ground wire in ABS module. VW TSB #45 15 01. | Repair and Retest. |
Section E: Permanent Diagnostic Trouble Code Vehicles of Interest – PDTC Deep Dive for the Car Diagnosis Quiz Master
This section details vehicles known to have issues with Permanent Diagnostic Trouble Codes (PDTCs). Understanding PDTCs is advanced knowledge, perfect for those aiming to ace a car diagnosis quiz at the expert level.
| Make | Year | Model Engine (L); Fuel Type | Issue | Cause and Possible Remedy | Instructions to Inspector |
|---|---|---|---|---|---|
| Audi | 2010 | Q7; 3.0 (TDI/diesel) | PDTCs P0087, P0088, P053F will not clear. | No remedy available. | Test normally, OIS ignores these codes. |
| Audi | 2011-2012 | Q7; 3.0 (TDI/diesel) | PDTCs P0087, P0088, P053F, P064A, P2635, P0230 will not clear. | No remedy available. | Test normally, OIS ignores these codes. |
| Chrysler | 2011-2015 | 200; 2.4, 3.6 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Chrysler | 2010-2014 | 300; 3.6, 5.7, 6.4 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Chrysler | 2017 | Pacifica Hybrid | Fails for PDTC C2200 or B22A9-00. | TSB 08-005-21 & 08-006-21. | Reflash, retest. |
| Chrysler | 2018 | Pacifica Hybrid | Fails for PDTC C2200 or B22A9-00. | TSB 08-008-21 & 08-009-21. | Reflash, retest. |
| Chrysler | 2019 | Pacifica Hybrid | Fails for PDTC C2200 or B22A9-00. | TSB 08-011-21 & 08-012-21. | Reflash, retest. |
| Chrysler | 2011-2015 | Town and Country; 3.6 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Dodge | 2011-2014 | Avenger | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Dodge | 2011-2012 | Caliber; 2.0, 2.4 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Dodge | 2011-2015 | Challenger; 3.6, 5.7, 6.4 | Fails for PDTC U0140. | Recall V51. | Reflash, retest. |
| Dodge | 2011-2014 | Charger; 3.6, 5.7, 6.4 | Fails for PDTC U0140. | Recall V51. | Reflash, retest. |
| Dodge | 2011-2015 | Grand Caravan; 3.6 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Dodge | 2010-2011 | Dakota; 3.7, 4.7 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Dodge | 2013 | Dart; 2.0 | Fails for PDTC U0140. | Recall V50 & V51. | Reflash, retest. |
| Dodge | 2013 | Dart; 2.4 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Dodge | 2014-2015 | Dart; 2.0, 2.4 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Dodge | 2011-2014 | Durango; 3.6, 5.7 | Fails for PDTC U0140. | Recall V51. | Reflash, retest. |
| Dodge | 2011-2015 | Journey; 2.4, 3.6 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Dodge | 2010-2011 | Nitro; 3.7, 4.0 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Ford | 2011-2014 | Mustang; 3.7 & 5.0 (gasoline) | Fails for PDTC P0315. | Vehicle not self-clearing PDTC. Program 17N01. | Refer to Ford, Customer Satisfaction Program 17N01. |
| Freightliner | 2014-2015 | Sprinter 2500 Sprinter 3500 (diesel) | Fails for PDTCs P202A, P203A, P208A, P20B9, P20BD, P20BE, P20FA. | Vehicle not self-clearing PDTC. | Test normally, OIS ignores these codes. |
| Jeep | 2014-2015 | Cherokee; 2.4, 3.2 | Fails for PDTC U0140. | Recall V51. | Reflash, retest. |
| Jeep | 2010 | Commander; 5.7 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Jeep | 2010-2015 | Grand Cherokee; 3.6, 5.7, 6.4 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Jeep | 2014-2017 | Grand Cherokee (diesel) | Fails for PDTC P1D30. | Vehicle not self-clearing PDTC. | Test normally, OIS ignores this code. |
| Jeep | 2010-2012 | Liberty; 3.7 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Jeep | 2011-2015 | Patriot / Compass; 2.0, 2.4 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Jeep | 2010-2015 | Wrangler; 3.6, 3.8 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Mercedes | 2010-2013 | 350 Bluetec | Fails for PDTCs P203D, P20B6, P20BD, P20BE. | Vehicle not self-clearing PDTC. | Test normally, OIS ignores these codes. |
| Mercedes | 2014-2015 | Sprinter 2500 Sprinter 3500 (diesel) | Fails for PDTCs P202A, P203A, P208A, P20B9, P20BD, P20BE, P20FA. | Vehicle not self-clearing PDTC. | Test normally, OIS ignores these codes. |
| Ram | 2010-2014 | 1500; 3.6, 3.7, 4.7, 5.7 | Fails for PDTC U0140. | Recall V51. | Reflash, retest. |
| Ram | 2013 | 1500; 3.6, 5.7 | PDTCs will not clear. | Recall V50. | Reflash, retest. |
| Ram | 2014-2017 | 1500 (diesel) | Fails for PDTC P1D30. | Vehicle not self-clearing PDTC. | Test normally, OIS ignores this code. |
| Ram | 2010-2015 | 2500; 5.7, 6.4 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Ram | 2011-2015 | 3500 Cab Chassis; 5.7, 6.4 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Ram | 2013-2015 | 3500 Pickup; 5.7, 6.4 | PDTCs will not clear. | Recall V51. | Reflash, retest. |
| Ram | 2014 | Promaster; 3.6 | PDTCs will not clear. | Recall V50. | Reflash, retest. |
| Volkswagen | 2010 | Touareg; 3.0 (TDI/diesel) | PDTCs P20B5, P0087, P0088, P053F will not clear. | No remedy available. | Test normally, OIS ignores these codes. |
| Volkswagen | 2011-2012 | Touareg; 3.0 (TDI/diesel). | PDTCs P20B5, P0087, P0088, P053F, P064A, P2635, P0230 will not clear. | No remedy available. | Test normally, OIS ignores these codes. |
Section F: BAR-97 EIS Vehicles of Interest – Vintage OBD Challenges for Your Car Diagnosis Quiz
This section focuses on model-year 1996-1999 vehicles with monitor readiness issues during BAR-97 EIS inspections. These older systems present unique challenges, making them excellent topics for a car diagnosis quiz focused on OBD history and evolution.
| Make | Year | Model Engine (L); Fuel Type | Issue | Cause and Possible Remedy | Instructions to Inspector |
|---|---|---|---|---|---|
| BMW | 1996 | 7-Series, 8-Series 5.0L, 5.4L | Monitors difficult to complete. | EIS ignores readiness status. | |
| Chrysler | 1996 | Cirrus, Concord, LHS Sebring Convertible | Monitors reset on key-off. | Recall #678 (CA), TSB #18-005-01 (lifetime warranty). | Comply with recall, test normally. |
| Chrysler | 1996 | Concord, LHS, New Yorker, Sebring, Town & Country 2.0L, 2.4L, 2.5L, 3.3L, 3.5L | Monitors difficult to complete. | EIS ignores readiness status. | |
| Chrysler | 1998-1999 | Town & Country 3.3L Flex Fuel | Monitors may not function with ethanol. | Test as normal. | |
| Dodge | 1996 | Stratus, Intrepid, Neon | Monitors reset on key-off. | Recall #678 (CA), TSB #18-005-01 (lifetime warranty). | Comply with recall, test normally. |
| Dodge | 1996 | Avenger, Stratus 2.0L manual | Monitors difficult to complete. | EIS ignores readiness status. | |
| Dodge | 1996 | Stealth 3.0L | Monitors reset on key-off. | Not reflashable. | EIS ignores readiness status. |
| Dodge | 1998-1999 | Caravan 3.3L Flex Fuel | Monitors may not function with ethanol. | Test as normal. | |
| Eagle | 1996 | Vision | Monitors reset on key-off. | Recall #678 (CA), TSB #18-005-01 (lifetime warranty). | Comply with TSB, test normally. |
| Eagle | 1996-1997 | Talon 2.0L | Monitors difficult to complete. | EIS ignores readiness status. | |
| Ford | 2020-2022 | F-53 Motorhome, F-59 Commercial Stripped Chassis (Gasoline) | No OBD communication. | Design issue, software update available. SSM 50974. | Test normally, direct to Ford dealer for software update if no communication. |
| Ford | 2021-2023 | F-650, F-750 (Gasoline) | No OBD communication. | Design issue, software update available. SSM 50974. | Test normally, direct to Ford dealer for software update if no communication. |
| Hyundai | 1996 | Accent 1.5L Elantra 1.8L Sonata 2.0L | Monitors difficult to complete. | EIS ignores readiness status. | |
| Hyundai | 1997-1998 | Sonata 2.0L, 3.0L | Monitors difficult to complete. | EIS ignores readiness status. | |
| lnfiniti | 1996 | All models | Catalyst/evaporative monitors difficult. | TSB #ITB98-011F drive cycle. | Test as normal. |
| Kia | 1996 | Sephia Sportage | Monitors difficult to complete. | EIS ignores readiness status. | |
| Lexus | 1996-1999 | All models | Monitors difficult to complete. | Lexus service info drive cycles. | Test as normal. |
| Mercedes-Benz | 1996 | C220, E320, C280, S320, SL320 | MIL illuminates with scan tool, no codes. | OBD II RPM source issue. | Connect OBD II only when prompted, use conventional RPM method. |
| Mitsubishi | 1996-1997 | All Models | Monitors difficult to complete. | EIS ignores readiness status. | |
| Mitsubishi | 1998 | Eclipse (all), Galant 2.4L, Mirage, Montero Sport 2.4L | Monitors difficult to complete. | EIS ignores readiness status. | |
| Mitsubishi | 1998 | 3000GT, Diamante, Galant 2.3L, Montero, Montero Sport 3.0L | Some monitors difficult. | Mitsubishi service manual drive cycles. | Test as normal. |
| Mitsubishi | 1999 | All models | Some monitors difficult. | Mitsubishi service manual drive cycles. | Test as normal. |
| Nissan | 1996 | Sentra 1.6L & 2.0L manual, 200SX 1.6L, 240SX 2.4L, Maxima 3.0L, Pickup 2.4L | Monitors difficult to complete. | EIS ignores readiness status. | |
| Nissan | 1996-1997 | All models | Catalyst/evaporative monitors difficult. | Nissan TSB #NTB98-018G drive cycle. | Comply with TSB, test normally. |
| Nissan | 1999 | All models | Monitors difficult to complete. | Owner’s manual drive cycle. | Test as normal. |
| Plymouth | 1996 | Breeze, Neon | Monitors reset on key-off. | Recall #678 (CA), TSB #18-005-01 (lifetime warranty). | Comply with recall, test normally. |
| Plymouth | 1998-1999 | Voyager 3.3L Flex Fuel | Monitors may not function with ethanol. | Test as normal. | |
| Saab | 1996-1998 | 900 2.3L (B234 with Motronic 4.1) | Monitors difficult to complete. | EIS ignores readiness status. | |
| Saab | 1996-1998 | All models | Catalyst/evaporative monitors difficult. | Saab Service Instruction No. 248-9037 drive cycle. | Comply with TSB, test normally. |
| Subaru | 1996 | All models | Readiness cleared at key-off. | EIS ignores readiness status. | |
| Toyota | 1996-1999 | All models | Monitors difficult to complete. | Toyota service info drive cycles. | Test as normal. |
| Toyota | 1996-1997 | Tercel, Paseo | Evaporative monitor never completes/unsupported. | EIS allows one incomplete monitor. | Test as normal. |
| VW | 1997-1999 | Passat | No OBD communication; Transmission Control Module response only; ABS/brake lamp illuminated. | Broken ground wire in ABS module. VW TSB #45 15 01. | Repair and retest. |
| Volvo | 1996-1998 | All models | Monitors difficult to complete. | Service Bulletin 25-19 drive cycles. | EIS ignores readiness status. |
