I recently purchased a 99 jetta wolfsburg ed. and around the 50,000 mile mark my check engine light came on. I got the obd test result saying that it was the camshaft position sensor circuit range/performance. code p0341. Could it be a bad sensor or should i get something else checked out. I read that it is a common problem that can be fixed by changing the timing belt, but the car has been running great. what should i do?
Hello, CMP sensor (G40) seems to be a pretty common failure. As you've done no recent work to disturb it I would test it first but it's probably bad.
You can test it out by pulling fuse 18 and disconnecting the harness at the CMP. Connect a VOM or DMM across the wo outer terminals. I assume you have the 2.0 liter in which case you will need to register a minimum of 4VDC, it's 10VDC if you have the VR6. If your voltage is present it will likely be the sensor. If it's not you will need to check your wiring.
If you do have voltage and you want to test further you are going to need an LED test light (according to the book). You'd reconnect the wiring but pull back the boot to expose the terminals and bridge it from the center to either outer terminal, crank the engine, it should flicker.. If it doesn't the entire unit will need replaced.
P0341 will be set if the distributor is not properly installed (turned CW or CCW off of alignment) or if mechanical timing is off (such as would be the case if your belt had stretched). It might be wise to check to make sure that everything lines up to TDC before replacing the distributor. Also, if you have access to a VAG interface, you can check the phase deviation of the sensor, which would be an indication whether it is working properly.
I have a '98 Jetta VR6 and the testing of the camshaft position sensor did not yield a voltage between the outer pins 1 and 3. I ohmed the wiring back to the ECM and wires were present. I did not perform the led test because of not being clear on how to do it. I have the Bentley Manual, but could not find where the procedure. Can anyone help!