The crankshaft position sensor may fail. Symptoms of this are: The engine will crank—but not start—especially when the engine is warm. The car may start again if it is left to cool off, but it may run roughly or have poor performance.Google+
Car Problem Reports
Mercedes-Benz S430 Engine Performance Problems Due to Crankshaft Position Sensor Failure
Mercedes-Benz S430 Problem
Average Mileage: 105,065 mi (59,225 mi - 159,000 mi)
Visitor, 2000 Mercedes-Benz S430, 122,000 mi
Car stops on stop signs and lights, Replaced crank position sensor.
Visitor, 2004 Mercedes-Benz S430, 78,500 mi
same exact issue. had repaired for $200
Visitor, 2004 Mercedes-Benz S430, 65,000 mi
Car would stall for no reason.After waiting for a few minutes it would crank but not start right away.After waiting for 15 minutes car would start.Replaced crank shaft assembly.
Just wouldnt start. never gave a indication.
Visitor, 2000 Mercedes-Benz S430
same problem. Car won't start at a traffic light. Can be restarted after 20 minutes when the engine is coooled down.
Visitor, 2001 Mercedes-Benz S430, 59,225 mi
Went to the airport got stuck there got towed to the dealer dealer must have known from what i explained but still charged for diagnos i wish i have seen this site before
Engine will crank, but will not start
Visitor, 2000 Mercedes-Benz S430, 112,000 mi
Just had the sensor replaced for $264.00 Runs like a champ.
Car would stop running. Wouldn't start right away. Started again after 10-15 minuntes. Replaced the Crank Sensor and problem was resolved.