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 CLK320 Engine Performance Problems Due to Crankshaft Position Sensor Failure
Mercedes-Benz CLK320 Problem
Average Mileage: 94,979 mi (48,000 mi - 152,360 mi)
Visitor, 2001 Mercedes-Benz CLK320, 50,000 mi
I would be driving along and the car would die. The dash lights would come on and I'd have to coast to a stop. When the car cooled off, it would start again. Turned out to be crankshaft position sensor failure.
My car stalled and would not start again. Even worse, I was on Market St in San Francisco and blocking Muni light rail cars. I had the car towed to my mechanic who diagnosed and repaired the problem by replacing the crankshaft position sensor.
Visitor, 2004 Mercedes-Benz CLK320, 92,000 mi
car cut off at red light engine light came when the car cooled down it came back on engine went off. Took it a repair shop said it was the crankshaft sensor said the part is $60.00 but located in a difficult place. $377.00 to get fix
Visitor, 2003 Mercedes-Benz CLK320, 85,000 mi
when turned the key to start, it took little longer to crank what it usually does and the car has started, I immediately see the check engine light on my dashboard. Took a trip to Benz dealer, he checked the code and said the crankshaft position sensor has failed and need to replace. No safety issues but just might not start the car when engine is hot. It would start when cool down.Replaced the sensor for 450$ at the dealer.
Visitor, 2005 Mercedes-Benz CLK320, 95,000 mi
Twice after parking the car for a short time it would turn over but not start when I was ready to leave. After lots of trying (5+ minutes) I could eventually get it running. Eventually the car started to stall when stopped in traffic but would restart after several tries. Diagnosis was "failed intermittent crank sensor" and cost will be $630 to fix.
Visitor, 2005 Mercedes-Benz CLK320, 48,000 mi
Crankshaft Position Sensor failed got to work and car wouldn't start.
Visitor, 2004 Mercedes-Benz CLK320
Failed Crank Position Sensor caused intermittent problem starting / activated check engine light.
Car has about 74K miles...
Visitor, 2005 Mercedes-Benz CLK320, 140,000 mi
same exact problem with my clk. car will only start when cooled down.
Visitor, 2005 Mercedes-Benz CLK320, 64,000 mi
Car would die at idle at not restart. Replaced Crackshaft position sensor. Problem resolved.
Visitor, 2003 Mercedes-Benz CLK320, 142,000 mi
I had the crankshaft sensor replaced 3 years ago. I have to replace it again. Sometimes it will have to sit, then it will right up.