Missing O2 sensor

monkeyburglar
Tue, 04 Jan 2011 17:13:41 +0000
Maintenance/Repairs

I’m an experienced mechanic, and have never been stumped till now. My check engine light is on, and has been since I bought it. I checked the OBD code and it came up as P0138, down stream O2 sensor. Easy fix I thought. Problem is, there is no down stream sensor, not even a hole in the pipe where it should be. Upstream is there, but no down stream. My first thought is that someone monkeyed with the exhaust and clipped the wires where the sensor should plug in. Problem is, it appears to be factory issued exhaust, mopar stars and all. And I can not find even clipped wires for the plug in that should be there. Looks like it came from the factory with no down stream O2 sensor. I even checked to make sure it wasn’t a Mexican or Canadian model. It’s U.S. Any help would prevent an on coming mental breakdown. Thank you.

6 posts - 5 participants