Five problems related to loud engine noise have been reported for the 2012 Mercedes Benz C250. The most recently reported issues are listed below.
Tl the contact owns a 2012 mercedes-benz C250. While driving 70 mph, the contact heard an abnormal noise coming from the engine. The vehicle was taken to mercedes-benz of covington (located at 8080 westshore drive, covington, la 70433, (985) 900-1212) where it was diagnosed that the camshaft gear-sprocket and exhaust cam adjuster needed to be replaced. The vehicle was repaired. The manufacturer was not contacted. The approximate failure mileage was 115,000.
Takata recall. Horrible noise coming from engine. Scared it is the dreaded camshaft and timing chain combo. It is ridiculous this has yet to be recalled by mercedes. Not safe as the car can leave you stranded without notice.
The contact owns a 2012 mercedes-benz C250. The contact heard an abnormal noise coming from the engine compartment when the vehicle was started. The failure occurred without warning. The vehicle was towed to mercedes-benz of san diego in san diego, CA where it was diagnosed that the cam shaft adjuster was defective and needed to be replaced. The failure was not repaired. The manufacturer was notified, but only offered the contact a discount towards the cost of the repair. The failure mileage was approximately 49,000. The VIN was not available.
The contact owns a 2012 mercedes-benz C250. Upon starting the vehicle, a loud noise was heard coming from the engine compartment and the service engine indicator illuminated. The vehicle was taken to an independent mechanic where the contact was advised that the camshaft and timing chain needed adjustment. The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was 56,000.
When starting up the vehicle make a terrible noise that last for 3-4 seconds before it goes away. The vehicle was verified by a mercedes technician and the diagnostics came back stating an issue with the "camshaft adjusters (internal fault)". I was told this condition will get worse and finally engine will stall and major damages will happen. Worst scenario could produce bent valves and will require a major engine overhaul with just 48,304 miles on it. Apparently, C250s are having this issue and customer are paying the consequences for a defective product. By the way, engine has been perfectly maintained with mobil 1 (ow-40) and original filter every 5,000 miles instead of the 10,000 miles interval recommended by the manufacturer. This condition could lead to a major failure while driving the vehicle that could end up into an accident.