IF YOU CONFIRM One or more of the following DTCs has set: * P0037 - HO2 HTR (B1) (Heated oxygen sensor 2 heater control circuit low) * P0038 - HO2 HTR (B1) (Heated oxygen sensor 2 heater control circuit high) * P0137 - HO2S2 (B1) (Heated oxygen sensor 2 circuit low voltage) * P0138 - HO2S2 (B1) (Heated oxygen sensor 2 circuit high voltage) * P0139 - HO2S2 (B1) (Heated oxygen sensor 2 circuit slow response) * P2096 - POST CAT FUEL TRIM SYS B1 (Post catalyst fuel trim system too leanbank 1) * P2097 - POST CAT FUEL TRIM SYS B1 (Post catalyst fuel trim system too rich bank 1) ACTION 1. Refer to step 6 in the SERVICE PROCEDURE to confirm this bulletin applies to the vehicle you are working on. If this bulletin applies: 2. Replace the rear O2 sensor. 3. Reprogram the ECM See this bulletin for further detail.
