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P0136 Diagnostic Meaning for 1999 Ford Expedition with 5.4L Engine

Model: 1999 Expedition Fault Code: P0136 Posted: 2015-09-23 21:03

I'm seeking clarification on what the OBD-II diagnostic code P0136 means specifically in a 1999 Ford Expedition equipped with a 5.4L V8 engine. This code is related to the oxygen sensor system and may indicate an issue with the second oxygen sensor on Bank 1, located on the passenger side rear of the vehicle. I would like to understand the possible causes and troubleshooting steps for this fault code.

Related fault codes
P0136
Comments (2)
Anonymous 2015-09-23 21:03

Code P0136 indicates a malfunction in the oxygen sensor system, specifically related to Bank 1 Sensor 2 on the 1999 Ford Expedition.

Anonymous 2015-09-23 22:18

The most likely cause is a faulty oxygen sensor on Bank 1, Sensor 2—located on the passenger side rear—or damaged wiring connected to this sensor. Check for corrosion, loose connections, or sensor failure when diagnosing.