[oblivion202]

Does it feel like engine is running lumpy, there is a vacuum pipe under the airfilter which splits and causes engine to run a weak fuel mixture and brings up fault engine running at rich stop were the ecu detects the engine is running weak and tries to richen the fuel mixture to the max the ecu can goto. Also if you can read live data and see what your airmass is reading and your o2 sensors, the cam magnets are also a common problem mercedes have i think modified them and the electrical connection. hope this helps.