1996 Ford Explorer P0141 Error Code: How to Diagnose and Fix O2 Sensor Heater Circuit Issue
My 1996 Ford Explorer with 142,000 miles is showing a P0141 diagnostic trouble code, indicating an issue with the oxygen (O2) sensor heater circuit in Bank 1, Sensor 2. I suspect a faulty O2 sensor or a damaged wiring harness. How can I determine which component—sensor or wire—is actually causing this error? What steps should I take to verify whether the sensor is bad or if there's a wiring fault?
Bank 1 refers to the side with cylinder #1 (typically the right side), and Sensor 2 means the oxygen sensor located after the catalytic converter. If you have a multimeter, you can test the heater circuit resistance using an ohm setting. A reading of 'open' or infinite resistance typically indicates a faulty sensor. In most cases, the issue is caused by a bad O2 sensor.