I have a 2001 E class 240 Estate which works perfectly most of the time. Occasionally the yellow engine management light comes on and the car tick over becomes rough and may lack power. The car never stalls and if I stop, switch off, and restart, the problem goes away although the warning light stays on for perhaps three further starts. There seems no pattern to when the problem occurs - sometimes when overtaking at highish revs, other times at low speeds.
The diagnostic system shows there was a fault but not what caused it! I am about to let the Mercedes dealer investigate but would like to give him some advice before I get a hefty bill for his investigation.
Can anyone help?