2013 Mercedes Benz ML350 (W166) engine (m276) began misfiring. Palm Springs Mercedes Benz diagnosed faulty camshaft positioning sensor leaking engine oil into engine electrical harness which wicked through harness to ECU. Faulty (leaking) camshaft positioning sensor caused faulty harness, ECU, injectors, o2 sensors. Said common problem on these and other models and engines.

- Quartz Hill, CA, USA

The seal for the oil cooler is leaking and could cause an engine fire. The Mercedes repair says they only expect this repair to last 30,000 miles before it fails again. Each time this fix occurs it is a $4,800 repair by the dealer as they have to tear the engine apart to replace it. This is a known issue but there are no recalls. Oil runs under the entire car and on to the braking surfaces as well. I was told by the Mercedes dealer that fires have happened from this while driving or as the car or SUV is parked.

- Lake Oswego, OR, USA

Oil cap from the top of the engine leak oil slowly causing the oil get into the air hose in front of the engine. Engine light comes on.

- Bothell, WA, USA

The contact owns a 2013 Mercedes-Benz ML350. While the vehicle was stationary and while driving various speeds, the oil cooler failed. The contact stated that a significant amount of oil leaked onto the engine during a routine oil change. Sullivan-parkhill imports (401 West marketview drive, champaign, Illinois 61822, (217) 352-4161) diagnosed that the cooler gasket was faulty and needed to be replaced. In addition, the dealer stated that the engine needed be to cleaned due to significant amounts of oil leaking onto the motor of the diesel engine. The vehicle was taken to be repaired. The manufacturer was made aware of the failures. The failure mileage was approximately 120,000. Consumer oil seal leak -blows oil over all over engine.

- Danville, IL, USA

I was driving on the highway at 70 mph, the check engine came on and about 5 seconds later, a loud noise came probably from the engine. The car then started jolting back and forth; I hit my head on the steering wheel twice and got almost knocked out. The engine stopped while I was still running at 70 mph. Most if not all the lights in my dashboard came on then I started slowing down. The seat belt never tightened on me as the car was jolting. I kept the car rolling and got out of a very dangerous situation. As the car came to a halt, a lot of engine oil leaked on the street, maybe about aquart. I took a picture as I just got out of the car. Also, as the towing took the car, the towing bed got over a quart of engine oil that leaked from my car. I towed the car to mercedez Benz of novi but they refused to take it. They ordered me to towed it out and tow it back to them two weeks later. I towed it to Mercedes Benz of bloomfield on September 6. I notified mbusa of this incident on September 7 and provided them access to check the car but they showed no interest whatsoever in looking at the complaint as the vehicle has 92,273 miles and is out of warranty. They instead offered me a $2,000 discount on a purchase of another vehicle. Neither the dealership nor mbusa verified the car for safety related issues on the engine or seat belt though it was and still is parked at the mb dealership of bloomfield. I could have easily went unconscious from the jolting and hitting my head on the steering wheel. I think there is a major safety issue that requires at a minimum for the manufacturer to look at let alone issue a recall for safety reasons on the engine and the seat belt.

- Troy, MI, USA

I keep experiencing the "pre-safe limited" warning. The car break starts fading, and the check engine light remained on the working conditions. This situation is so unsafe because the car becomes heavy and the steering turns hard to maneuver.

- New York, NY, USA

In May 2017, while driving, check engine light came on. Acceleration was extremely reduced in a very dangerous way. Took vehicle to dealer. Dealer diagnosed problem as an oil leak that has been leaking on the wiring harness, which caused wiring/electrical system for entire vehicle to completely fail. Estimated repair is $13,500. The vehicle has 34K miles, and the original factory warranty expired in late February 2017. Had routine oil change at dealer in February, no oil leak detected. Dealer service tech was very familiar with this issue and has seen ten or so of them. Unprotected wiring harness seems to be a manufacturing defect. Several months prior to warranty expiration, reported small electrical problems to mb dealer, but dealer was unable to replicate/determine cause. All scheduled maintenance completed at mb dealer per mb schedule. Contacted mbusa to request a goodwill repair credit given the nature of the repair, the history of the vehicle, history with mb, etc. And since this defect likely predated warranty expiration. Mbusa customer care center was indifferent. Parts alone are $8,000. Mbusa offered to contribute only 10%.

- Dallas, TX, USA

While at highway speeds vehicle braked unexpectedly due to what seems to be a malfunction in the front collision warning radar. This resulted in a multiple near miss collisions coming from the rear, for many vehicles on I5 near woodburn or during high traffic times. The vehicle suddenly braked causing me to swerve off the road. Other vehicles includes two immediately following, there was a vehicle 6-8 car lengths ahead traveling at the same rate of speed with no braking, both sides were clear of traffic, no damage done seeking dealer assistance to decipher exact cause. Vehicle continues to have all safety features automatically turned off from computer. Vehicle was traveling straight with no braking needed nor wanted.

- Tualatin, OR, USA