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On-Board Diagnostic II
Vehicles with OBDII Testability Issues
The table below (from the U.S. EPA and other sources) is a list of vehicles that are known to have problems when performing an OBDII test. The vehicle may experience a problem with either the vehicle's communication with the test center's test computer or may have a problem setting the proper number of readiness codes.

This list was complied for vehicle owners facing OBDII emissions testing. If your vehicle is on this list, either have your dealership "re-program" your on-board computer using the appropriate technical service bulletin (TSB) or make sure the testing center is aware that your vehicle may have a precondition that will cause the vehicle to fail the test.

OBDII Problem Vehicles
Year Make Model Problem Resolution
1996 Mercedes C220, E320, C280, S320, SL320 MIL falsely illuminated during KOER test when scan tool is plugged in there is no "reprogramming" available to repair this condition
1996 Mitsubishi All MIL not on and no DTC’s, but scanner indicates the MIL is commanded on Vehicle will fail, and should be returned to dealership, recall #EMR-02-001
96-02 VW, Audi All if aftermarket stereo is installed, OBD system may not communicate properly during test this would probably result in a failure to communicate and the vehicle would have to be repaired to pass the OBDII test
1996 Dodge Stealth w/3.0L engine all monitors set to not ready when the ignition switch is turned off should be included in the readiness exclusion list
96-97 Mitsubishi Diamonte, 3000GT, 3000GT Spyder, Montero, Montero Sport w/3.0L and 3.5L engines all monitors set to not ready when the ignition switch is turned off should be included in the readiness exclusion list
1996 Subaru All all monitors set to not ready when the ignition switch is turned off should be included in the readiness exclusion list
1996 Volvo 850 Turbo all monitors set to not ready when the ignition switch is turned off should be included in the readiness exclusion list
1996 Chrysler Cirrus, Concorde, LHS, Sebring, Sebring Convertible all monitors set to not ready when the ignition switch is turned off should be included in the readiness exclusion list
1996 Dodge Avenger, Intrepid, Stratus, Neon all monitors set to not ready when the ignition switch is turned off should be included in the readiness exclusion list
1996 Eagle Talon, Vision all monitors set to not ready when the ignition switch is turned off should be included in the readiness exclusion list
1996 Plymouth Breeze, Neon all monitors set to not ready when the ignition switch is turned off should be included in the readiness exclusion list
1996 Infinity All catalyst and evaporative monitors difficult to set See Nissan TSB #98-018C
96-98 Mitsubishi All except 3.0L and 3.5L engines Some monitors difficult to set See Mitsubishi TSB#00-13-005
1996 Nissan All catalyst and evaporative monitors difficult to set See Nissan TSB #98-018C
96-98 SAAB All catalyst and evaporative monitors difficult to set See SAAB TSB#248-9037
1997 Toyota Tercel and Paseo the evaporative monitor will never set to completed should be included in the readiness exclusion list
96-98 Volvo All except 850 Turbo Some monitors difficult to set See Volvo TSB#2230056
1997 Nissan 2.0L 200SX catalyst and evaporative monitors are difficult to set to completed Nissan provides recommended driving cycles . See Nissan TSB #NTB98-018
96-01 Mitsubishi All models except non-turbo 2.0L, all equipped with 3.0L or 3.5L V6 engines some monitors are difficult to set to complete Mitsubishi provides recommended driving cycles to assist technicians to operate monitors. See Mitsubishi TSB #TSB-00-13-005
2003 Hyundai Tiburon All Will not communicate with generic OBDII test equipment A manufacturer recall is in effect, recall campaign #057 and Hyundai TSB #03-01-003-01

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