Hi,

I just recently replaced my cat converters due to P0422 code. But, after driving for like 10 miles, my check engine light went on again I took it to Autozone, and they pulled P0341 Camshaft Position Sensor. Do you guys know what that sensor for, and is it common in our W202?. Btw, thanks so much to KRUSTY for his help with P0422. Thanks guys.



DDTham

 

The camshaft position sensor is located on the front top right side of the engine (cylinder head) when looking at the engine (sticks out to the right). It is a Hall-effect sensor and they can sometimes go bad. The best thing to do is check the connection at the sensor. If it seems OK, have the dealer check the sensor on their system, as replacement seems like an easy DIY, but has complications. The clearance from the sensor to the camshaft sprocket segment must be 0.5mm, and it is set by the shim in behind the sensor as it is bolted to the head. The shims are available in 0.1mm increments, and the valve cover must come off to check the clearance. If you're adventurous, do it yourself. Get a new valve cover gasket and a few 0.1mm shims and away you go, but get the dealer to at least verify the sensor is bad. BTW, this sensor input is used by the ECU for ignition timing mainly.

 

Hey KRUSTY,


Thank you so much again for your help. Is it normal for the car to have rough acceleration (hesitating from 1500rpm-2000rpm) if the sensor is bad?. I also feel that the idle is lower than normal (around 650rpm) when I put it in D, is that also because of the sensor?. Once again, thank you so much for your help.


DDTham

 

That particular sensor can cause quite a few running symptoms including the ones you mentioned. I would check the wiring from the sensor to the ECU first. It's remotely possible the code you have in could be caused simply by the ECU not seeing the sensor due to a broken or shorted wire, then if everything checks out OK, deal with the sensor itself.

 

Thanks for your advices KRUSTY. This may sound stupid, but how do I clean up the connection to the ECU? I just cleaned up the plug today, and it actually helps a lot. Thanks again.



DDTham

 

A can of contact cleaner from any electronics place will work wonders, then use dielectric grease on the connections. You shouldn't need it on the ECU connection, just the ones in a harsh environment under the hood.

 

Hi Krusty,

Over the weekend, I cleaned the connection with contact cleaner and grease it with dielectric greaser like you suggested me too. I have to say it worked wonders, but after 1-2 day the problem starts again. But its not as bad as before, and most of the times it would be okay again. Do you have any clue what might be happening?. I am sorry if I asked too much, thank you so much for your help and time.

Regards,


DDTham

 

I would say that either the wires to that sensor are bad, or the sensor itself has something loose at the connector. The act of disconnecting/reconnecting may for a short time 'fix' the problem. You really need to get a wiring diagram to figure out which pins on the CANBUS connector the sensor wires end up at. Then you can check their continuity while wiggling the wires. That will isolate the sensor as the problem.

 

is there any real need to actually reshim the sensor(how do i even do that?) if you're getting a p0341 code along with confirmed p0201/202/203/204 for the ecu shutting off the injectors?

i replaced the cam and the crank position sensor but the car is still stalling every now and then when at a stop idling...any thoughts?