eric71

I had the crankshaft sensor (they replaced)and o2sensor (I did)replaced last week. Codes would come up when I drove on rough roads. The jeep would drop rpms and sometimes stall. One week later, driving on same rough roads and the same codes come up p0300, p0339, and p0032. I bring it back to the dealer and they see that my rear main seal is starting to leak. It has been leaking for three months now. Which I pointed out to them a while back because I thought it was a leak when they replaced my transmission. They come to the conclusion that oil is leaking onto the sensor. I asked the mechanic when they pulled out the last one was there any oil on it and he said no. As for the o2 sensor, they said that may have come up because I replaced it with a Bosch sensor not a OEM one. I don't want to pay 700.00 to fix the rear seal and it not solve the problem of the codes coming up. Any opinions out there? I need some help on this one. thanks

shj_jeep

did you solve the problem or not yet ? any updates ?

I am having the same problems and same codes

P0300 : Random misfire detected
P0339 : crank shaft position sensor A circuit intermittent
P0302 : cylinder 2 misfire

My jk is 2008 auto

Maertz

Is there oil in by any of the spark plugs or there boots?

RUBSAH

My wife's 08 sahara had the same codes. replaced the spark plugs with champion oem and problem gone.

Maertz

Yes could be spark plugs but if theres oil in there and there shorting it could be the valve cover gasket.. Could also be the spark plug wires but id check the plugs and for oil in by the spark plugsm