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Green Bay, WI

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For 6 months has occasionally threatened to stall, with onset of colder weather would not start readily, holding accelerator halfway down seemed to help. Check engine light came on once 4 months ago and logged code that air mass sensor failed. Replaced that & checked air filter. With onset of cold weather start problem ensued with regularity. Cold weather start problem first occurred at about 30K, dealership fixed under warranty. Have since taken it to independent import repair shop with excellent service history of 30+ years in NE Wisconsin. Bought extended 2-year warranty with car so forced to go to MB dealer with limited diagnostic skills. Was told that replacing regular octane with premium solved the problem......after they had it for 3 weeks. After reading on RepairPal about crankshaft sensor failure on C240s, asked if they had checked that and was pretty much dismissed.

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