The engine may develop a stalling and/or no start condition due to a failed crankshaft position sensor.Google+
Car Problem Reports
Mercedes-Benz ML350 Engine Performance Problems Due to Crankshaft Position Sensor Failure
Mercedes-Benz ML350 Problem
Average Mileage: 85,431 mi (38,366 mi - 145,000 mi)
Visitor, 2003 Mercedes-Benz ML350, 86,000 mi
Car would die after coming to a complete stop, and would not start afterwards. Would take a few tries, and waiting 5-15 minutes before the car would startup again. Currently getting car looked at at a shop to see if it is due to the crankshaft position sensor.
Visitor, 2003 Mercedes-Benz ML350, 70,000 mi
Car stops while driving. Very dangerous. Can't be restarted. Fuel pump, filter, crank shaft sensor all replaced. Still does this. Same symptoms as before the repair work done. ($1200) Now they want to test the keys.
Visitor, 2004 Mercedes-Benz ML350, 40,000 mi
same problem here in australia with our ml350
Visitor, 2004 Mercedes-Benz ML350, 126,000 mi
At 68,000 miles - Intermitent issue with starting - repaired at dealer as crankshaft position sensor failure and no problems since.
Visitor, 2008 Mercedes-Benz ML350, 69,000 mi
Gettting on fwy onramp and lost power while accelerating. The car would not go over 15mph. ESP light went on. Pulled over to shoulder and shut off car, once I turned back on light went off and car returned to normal, for now. Taking to dealership but feel very unsafe now.
Visitor, 2006 Mercedes-Benz ML350, 72,000 mi
The rude people at MBUSA never helped or acknowledged that this is a problem. Replaced it spending around $1900.
Visitor, 2003 Mercedes-Benz ML350, 98,125 mi
On highway,loss of power, dash board lite up. Able to pull over. Would start, as soon to put in gear, turned off.
Visitor, 2003 Mercedes-Benz ML350, 82,000 mi
I had the same problem. Kept having problem starting up at random. Turned out to be the sensor. Problem gone once replaced.
Visitor, 2005 Mercedes-Benz ML350, 102,000 mi
Failed start began last spring--increasing in frequency. Four trips to the dealership and $5000 in "repairs" have not fixed the problem. In for repairs again after it stopped in downtown Detroit and I was almost killed.
Visitor, 2007 Mercedes-Benz ML350, 38,366 mi
The Car stalled and then was hard to restart, also the engine would still be hard to start even though it was not hot or had been off for 15 minutes