I recently replaced the catalytic converters and oxygen sensors on my 2007 Chevrolet Avalanche. After clearing the trouble codes, the vehicle ran smoothly. However, the check engine light has returned. If I clear the codes using a scan tool, they stay off until I shut down the truck completely. Upon restarting, the same codes—P0054, P2F00, and P003
I'll investigate this issue further and update if I find a solution.
It's important to check the resistance of the new oxygen sensor's heating element. As I've learned, a scan tool capable of performing an O2 sensor heater resistance learning reset is required. Otherwise, the new sensor may overheat and fail prematurely. According to GM service information, this procedure must be completed properly—some tools like Snap-on do not support this function unless specifically programmed. I currently have a Snap-on scanner but haven't performed this step yet.
Refer to this forum thread for detailed explanations of possible causes and solutions related to these trouble codes. Common issues include an open circuit in the oxygen sensor, damaged power or ground wires connected to the sensor, or a corroded/exposed exhaust system ground strap. Additionally, failure in the PCM/ECM or oxygen sensor heater circuit wiring may be responsible. For more information on P0036, see related discussions.