Re: 2001 Ford F-150 Check Engine Light On.
I had a 98 Ranger with the 4cyl motor that had the same problem. I'm sure there's a thread on it here somewhere. Nevertheless, the problem for me wasn't the sensor, it was the wiring coming right off the sensor. And what a pain too cuz the sensor was on the motor where you can barely see or get your hands into. Ended up running new wires for it and it all worked fine. Different vehicle, same problem.... hope this could be of some help to you.