I have a 1999 Ford F150 4.2 engine. I have this stupid code coming up again. First I changed O2 sensor twice. Nothing!!! Had it diagnosed by Ford and Midas both said it was the PCM no readings. This was true. Had the pcm rebuilt and now I have reading but the code came back up. Obviouses are out of the picture. What and where should I look next? LT FTRM readings should be what? One is at 1.6 and the other is .8 with a little fluctuation. Any expert advice because this is really annoying. $1000 invested in diagnosis and still nothing. Please Help!!!!

 

Not an expert, so I'm sorry if you already knew this. Did you check the connections?

http://www.obd-codes.com/p0136