I have a ML320 01, the car shutt off without a warning and happend when is hot, a period of 20 minutes waiting time the car start again without a problem. My OBD reads the code PO410 (Secondary Air Injection System Malfunction). It is three possible causes, the air pump, the switchover valve or the oxigen sensor... or, maybe the fuel pump?
Any ideas which part is not working properly.
Thank you
mbenz66

 

actually it sounds like a crank position sensor or a fuel pump

 

The problem was the Crankshaft Position Sensor. Thank you.

Also I want to thanks Stuart Nancekievill, a true asset to the forum.

mbenz666