IF YOU CONFIRM: The MIL is ON and one or both of the following DTCs are found stored in the ECM: - P0139 (heated oxygen sensor 2 (B1) circuit slow response) - P0159 (heated oxygen sensor 2 (B2) circuit slow response) ACTION: 1. Confirm this bulletin applies. - Compare the vehicle's current ECM part number to those listed in Table A (see page 4). 2. If the ECM part number does not match one listed in Table A, this bulletin does not apply. Go back to ASIST for further diagnostic and repair information. 3. If this bulletin applies, reprogram the ECM. See this bulletin for further detail.
