My mechanic was a little stumped as to how they both are occurring at the same time. He cleared the codes but I wasn't able to let him keep the car to check what code sets off the check engine light first. Could both sensors be going bad? Does one affect the other? Thanks in advance.
why dont you tell people what sensors you are refering to....i personally dont feel like searching to find the codes
PO335 Is for the crankshaft position sensor malfunction, and the PO342 is for the camshaft position sensor malfunction, hey JPO how does the car run? What kind of aftermarket electronic equipment are you running on the car?, it's highly unlikely that both could be out at the same time, you really need to take it back to the mechanic and let him do a monitor test to see which sensor is actually casuing your problem.
sirmeza wrote:PO335 Is for the crankshaft position sensor malfunction, and the PO342 is for the camshaft position sensor malfunction, hey JPO how does the car run? What kind of aftermarket electronic equipment are you running on the car?, it's highly unlikely that both could be out at the same time, you really need to take it back to the mechanic and let him do a monitor test to see which sensor is actually casuing your problem.
When the CEL comes on the car runs pretty rough and the car seems to loose alot of power too. The mechanic cleared the codes yesterday and the CEL is still off for now. The last thing I did was replace the IDI coils and housing(done by same mechanic). He also checked the 2nd O2 sensor because it was throwing a heater code. It was getting 12 volts so he thinks that it is fine. The sensors are pretty cheap so I may just replace them if the CEL comes back on.
I am missing the fender shroud that covers the inside fender well where the pcm sits. Any one have issues with the pcm going bad due to this? Thanks again for the replies.
It's not uncommon to see both codes together. They indirectly reference each other. The best way to see what's going on is with a labscope or a scanner but if you have access to neither then you'll have to throw parts. Just make sure you check your wiring real good. GM did have a service bulletin out for running rough and the PCM wires corroding so if you inner fenders are missing that could contribute to the problem.
It's possible that one sensor is out of sync with the other.
If either sensor went dead, you'd get one code, the faulty sensor.
It's likely that both sensors are generating valid waveforms, but the phase between the signals is wrong. Either the crank sensor is lagging or the cam sensor is lagging, but the ECU doesn't know which, so it throws both codes. I'd look at one of the following:
1. A sensor has rotated in place somehow, throwing the phase off.
2. Your timing chain has jumped a tooth or several.
2002 Cavalier 2200 5spd
