SUBJECT: Rear O2 Sensor Diagnostics/OBD II Protocol
NO: 18-35-95
GROUP: Veh.Performance
DATE: Dec. 15, 1995
MODELS:
1996 (FJ) Avenger/Sebring/Talon
1996 (PL) Neon

NOTE: THIS BULLETIN APPLIES TO 1996 VEHICLES EQUIPPED WITH A
2.OL ENGINE (AVENGER/SEBRING/TALON BUILT PRIOR TO NOVEMBER 10, 1995 MDH (11-10-XX)) (NEON BUILT PRIOR TO NOVEMBER 14, 1995 MDH (11-14-XX)).
SYMPTOM/CONDITION:
1. Intermittent rear O2 sensor fault , Diagnostic Trouble Code(DTC) #129 with Malfunction Indicator Light (MIL)illumination.
2. Inability of generic scan tool to read all Diagnostic Trouble Codes(DTC's).
3. Inability to store OBD II Readiness Codes.
EQUIPMENT REQUIRED:
1 CH6000 Scan Tool (DRB III )
1 CH7035 General Purpose Interface Bus Cable (GPIB)
1 CH7010 J1962/MMC Cable
1 4669020 Label - Authorized Software Update
1 4275086 Label - Authorized Modification

NOTE: THE MOPAR DIAGNOSTIC SYSTEM MAY BE REQUIRED TO PERFORM PART OFTHE REPAIR AND THE SYSTEM MUST BE OPERATING WITH RELEASE 18OR HIGHER AND TIL CD RELEASE 1095 OR HIGHER MUST BEINSTALLED.
REPAIR PROCEDURE:
This repair involves selectively erasing and reprogramming thePowertrain Control Module (PCM) with new software (calibrationchanges) for all symptoms listed.

1. Connect the MDS (Mopar Diagnostic System) and DRB III (Scan Tool)to the vehicle and power them up.
2. Use the arrow keys and select #2 MDS DIAGNOSTICS on the DRB IIIMAIN MENU Screen.
3. Use the arrow keys and select DIAGNOSTIC MENU on the MDS, thenpress NEXT MENU.
4. Use the arrow keys and select CONTROLLER PROGRAMMING on theMDS, then press NEXT MENU.
5. Use the arrow keys and select PROGRAM CONTROLLER PART on theMDS, then press NEXT MENU.
6. Follow the steps presented on the MDS and DRB III which willallow the DRB III to obtain the current part number of thePCM.
7. The MDS will display the part number of the PCM on the vehicleand the appropriate replacement part number, then press NEXTMENU to begin programming.
If the PCM on the vehicle has already been updated orprogrammed, a NO UPDATES AVAILABLE message will be displayed.Check the part number of the PCM on the vehicle and compare itto the part number displayed. If the PCM has already beenupdated, then another condition exists that will requirefurther diagnosis and repair.
8. The MDS and DRB III will prompt for any operator action neededduring the remainder of the programming process.

NOTE: THE FOLLOWING STEPS ARE REQUIRED BY LAW.
9. Type the necessary information on the "Authorized Software Update Label" P/N 4669020. Attach the label to the PCM and cover the label with the clear plastic overlay.


10. Type the necessary information on the Authorized Modification Label and attach the label near the VECI Label.
POLICY: Reimbursable within the provisions of the warranty.