Good eveningI had the above car in today with the MIL on code P0101 MAF sensor range/performance.
I'm the third person to have a look and would like to crack it.
It has had a new siemens MAF fitted by the last person.
I have tested the MAF supply, ground and output on my scope. I am not totally happy with the output waveform, it starts off correctly then the trace suggests that the throttle valve is controlling the engine speed, IE not allowing WOT while stationary ( manual trans ) but by holding the engine at cruise and blipping 4.5v can be achieved
On the road it is slightly lacking power, using serial data the max output of the MAF is 444 kg/hr and max throttle valve angle is 79 degrees, full load detected. The code returns in the DTC's logged on last drive in EOBD.
I have checked the inlet tract and smoke tested, no leaks present and the exhaust does not appear to be blocked.
I have read about oil entering the loom from a cam actuator giving this fault I would appreciate any feedback on the MAF data from all you Mercedes experts out there.
Sorry to run on but wanted to give as much info as possible, thanks for reading
Glyn