2015 Ford Fusion in limp mode
I recently purchased a 2015 Fusion that had a P0141 O2 sensor error, car ran fine. Then, my daughter was driving it and it went into limp mode. Hooking it up to my code reader, this is what I saw :
Cleared the codes and got it home. Then ran fine.
CAR BACKGROUND According to the carfax, the car has been wrecked on both the left and right front, on different occasions.
WHAT I’VE DONE SO FAR Took it to my mechanic. He started it up in the morning, went into LIMP mode again. He cleared codes, drove it 50 miles with no issue.
Got it back, went into limp mode again. For the most part, same errors, with a new P06A7 “Computer and Auxiliary Outputs” error.
Looking at sensor readings while running in limp, noticed MAP sensor was reading 0 PSI. Unhook sensor and reading goes high. Decided to replace MAP. Ran fine, then limp. Thinking it was a bad ground, potentially due to the wrecks, I ran a wire between passenger side and battery. Restarted car and ran fine. Noticed MAP was responding with throttle, etc anywhere from 10PSI to 25PSI. Let it sit for a few minutes restarted, limp again. MAP was back to 0 PSI.
Not sure where to go next. The MAP acting weird makes me think there is a larger, potentially electrical problem. Thoughts please?
EDIT: Decided to take it into a shop because I was in over my head. Shop found there was oil in the harness where it connects to the ECM. Said he’s seen it before. Somehow oil weeps up from one or more of the sending units up the wire. They cleaned it thoroughly and added dielectric at the connection, but thinks it will happen again. I found oil in the variable cam timing oil control solenoid intake. Replaced both of those as they could be the culprit.
