IF YOU CONFIRM: There are no drivability issues. and The MIL is ON with one or more of the following Air Fuel (A/F) Sensor DTCs stored: - P0171 - FUEL SYS-LEAN-B1 (System too lean bank 1) - P0172 - FUEL SYS-RICH-B1 (System too rich bank 1) - P2096, P2097 - POST CAT FUEL TRIM SYS B1 - P015A - Air fuel ratio (A/F) sensor 1 (bank 1) ACTION: 1. Refer to step 6 in the SERVICE PROCEDURE to confirm this bulletin applies to the vehicle you are working on. 2. If this bulletin applies, reprogram the ECM and replace the A/F sensor. CAUTION: The ECM must be reprogrammed (if it applies) before the A/F sensor is replaced.
