1 have a 4 door 1996 Ford Explorer XLT with 235,000 miles a 4L V6 with 55,000 miles, automatic transmission with 75,000 miles, AC.
Codes P0102 and P0420
Several years ago I was driving when the engine quit. I tried to restart the engine and it would start, but then immediately die again. A friend suggested I disconnect the MAS, so I did and it started and remained running (although somewhat rough). I replaced the MAS and everything was fine for a couple years. It failed again in the same manner, so I replaced the MAS again and it worked just fine for several months before repeating again. I am now on my 4th failed MAS, so i am fairly certain that I have some other problem that is causing the MAS to fail, I just can't figure out what that might be.
The P0102 code indicates an issue with the MAS but it only appears after I disconnect the MAS.
The P0420 code comes and goes and is associated with the CAT which I can't see being involved with the MAS. I can see the CAT being affected by the MAS though.
There are 2 fairly low mileage Bosch O2 sensors replaced sometime after the new engine.
A friend suggested I disconnect the MAS
It's commonly abbreviated MAF (in case you're searching for parts on the web or over the phone)
P0102 code indicates an issue
specifically, a circuit low voltage condition. Try the troubleshooting here:
https://www.obd-codes.com/p0102
There could be a problem with the wiring, or your PCM
so I replaced the MAS again
This is the classic problem with a throwing money at a problem approach. It doesn't lead you to the root cause, and the problem keeps coming back.
- Are you buying OEM MAF sensors? If not you should
- MAF sensors are damaged by air contamination. Inspect/service your air filter, PCV, and EGR system.
- Address your cat problem. If it's plugged up, then it's going to back up and cause all sort of other problems. Air that goes through the cat is also going through the MAF
