Six problems related to engine rattling and whining sounds have been reported for the 2012 Mercedes Benz C250. The most recently reported issues are listed below.
Dealership diagnosed problem with camshaft adjusters. This happened 2 times already on the same vehicle, and it is very costly to fix ($4000). First time I had a rattling noise from engine, and check engine light on. First time it happened at 46k miles. Second time car hesitates to start, had long cranking, it happened at 69k miles. It is a systematic, very costly and potentially life threatening problem.
Rattling noise coming from engine at startup. Diagnosed as defective cam timing adjusters @ 65000 miles. This apparently an on going problem with this particular part(s) and causes major engine damage. Repair costs range from $3000 - $5000 and more if the engine is ruined.
After only 75k miles my mb has a failing part that is well known amongst all mb dealerships. The cam shaft adjustment units both intake and exhaust have failed, causing me to undertake repairs in excess of $3k. For such a newer vehicle this is unconscionable and many dealerships around the phoenix area have known about this issue for awhile and have expressed shock that this hasn't been a recall issue yet. I knew there was an issue with my mb when I started it up and there was a rattling noise coming from the engine portion of the vehicle. Each shop and dealership I've taken it to have noted it and have stated that repairs range from $3k to $4. 8k. Simply unacceptable. I am hoping the NHTSA will investigate and recall this car for this issue as it is a well-known issue and needs to be addressed.
The contact owns a 2012 mercedes-benz C250w. When the accelerator pedal was applied, the vehicle stalled without warning. Additionally, the vehicle made an abnormal rattling noise. The vehicle was taken to a local dealer (mercedes-benz of st clair shores located at 20200 e nine mile rd saint clair shores, mi 48080 586-773-2369) where it was diagnosed that the camshaft adjusters needed to be replaced. The vehicle was not repaired. The manufacturer was notified and did not offer any assistance. The failure mileage was 68,000.
The contact owns a 2012 mercedes-benz C250. Upon starting the vehicle, a rattling noise was heard coming from the engine and the service engine warning indicator illuminated. The vehicle was taken to an independent mechanic where it was diagnosed with a cam shaft issue, and the timing chain and sprockets needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the issue and informed the contact that there was a recall, but the vehicle year was not included. The failure mileage was unknown.
When starting the car the vehicle make loud rattling noise and the entire car shakes. I took the car to the mechanic and he said it is the camshaft adjuster/actuators. Which need to be replaced along with the timing chain. He also said it is not safe to drive as they can fail and car will stop in the middle of a road. The car when trying to accelerate sometimes doesn't want to go and you can actually fell the car jerk seeming as the chain is skipping. It has happened multiple times. Car has 67,000 miles and this started happening at 57k miles.