karomoney

While reassembling the valve cover on my N62 550i, I had also replaced the o-rings for the camshaft position sensors and eccentric shaft sensor.
Upon starting, my OBDII reader showed a P0393 code- camshaft pos sensor high input.

This led me to believe, initially, that I had missed a ground connection when reassembling. I tried cleaning the sensor, cleaning the connector, fastener, the whole thing. I double checked all grounds, and still have the running code. The engine will idle rough and begin to knock, which I'm assuming is due to some form of misfire caused by this sensor. Is my only option to replace the sensor?

Am I missing some other troubleshooting step/procedure? Let me know what you guys have experience with. I'm sure somebody with more experience than I do is shaking their head at the post.

seanjordan20

Are those 2 close together and are the same plugs. I don't can't remember if they are I do remember one time a friend worked on his car and switch the cam sensor with another sensor causing the same issue

karomoney

as far as i know sensors are interchangable. Same connections as well, same part numbers.

I don't recall ever having mixed the two up though. Thanks

tstiglich

Don't know squat about BMW sensors, but back in the day writing code for Ford. Sensors would operate from +V to ground. Pulse would either be high or low. High / low would never be the extreme, in order to detect shorts. For example, for a 5V sensor, valid input may be 0.5 to 4.5V. For a 12V sensor, maybe 11.5 to 0.5V. Get out a volt meter and check the output signal.

tstiglich

I am guessing either a bad sensor, or a shorted wiring harness.

CVTBenhogan

Had the same code. Make sure the sensor is tight and flush to the valve cover. I decided to Install sensors and the bolt with the valve cover off. That cleared the code for me.

donpb

@karomoney So did you find a willing mechanic or still toughing it out?

ForzaK

Hi, sorry to bother ya but I seen this topic was talking about the same thing that I'm currently having an issue with. So I'm curious to know if my crankshaft sensor connector readings could be the culprit or if its not. So I also ready in my BMW Manual, (09 550i E60 N62B48) that CKP and CPS both have a 12v, ground, 5v signal

The reading I'm getting on my connector are as follows:
12v - I'm getting a reading of 11.5v
5v- I'm getting a reading of 10.5

The 10.5V signal is the one that has me confused, not sure if it's supposed to read that high or not. Wondering if you know any more information that could help me out?
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