thwelding289

just purchased a 2008 cls550, there is a code p2090 camshaft position sensor. have taken the vehicle to a shop specializing in BMW and Mercedes. they replaced all of the correlating sensors, camshaft position as well as vvt adjusters and code did not go away. Shop recommended a new ECU, i sent the ECU to have it tested at ECU pros and they could not recreate the code on a bench test or in the test vehicle. reinstalled the ecu and the code remains. Does anyone have any insight to what the solution could be or where to look next. The car runs great, no rough idle no hesitation no miss fires or hard starts. typically i would just let it go but the vehicle has to pass smog to be registered and will not pass with any stored DTC. i can clear the code and it will remain cleared for any length of driving, once the car is shut off and restarted it will reappear.

nd-photo.nl

Does the sensor need to be coded/learned/resetted before it works?