There are 11 owner-reported engine complaints for the 2014 Mercedes-Benz E-Classin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
Issue with fuel injection for Benz E350 2014 2014 Mercedes-Benz E350 fuel injection issues often stem from faulty injectors causing misfires, often on Cylinder 5, or a recalled fuel feed line. Symptoms include rough idling, reduced gas mileage, stalling, and check engine lights (P0300-P0306 codes).
The camshaft adjuster failure. Though I'm told safety is not in immediate danger, it's a very expensive fix that can cause other issues if left unpaired. It began subtly with strange noises, hesitation during start-up, inconsistent performance. I take meticulous care of this vehicle. Regular service. Genuine parts. Always handled with care. And yet, here I am, facing a repair bill that is not only shocking, but unjust. Especially for this to be a common problem. Not to mention the potential for severe engine damage if left unresolved. I’ve since learned that I am not alone. Many loyal Mercedes owners have faced the same issue; often at relatively low mileage, with little to no warning. This is not an isolated defect. It is a systemic issue with significant implications, not just for the vehicle, but for the trust your customers place in your brand. To say I’m disappointed is an understatement. I feel let down. Mercedes-Benz has always held a status. A great looking car. A great engineered car. And while this is a great looking car, it has a serious engineering flaw. German and Japanese engineered cars hold the standard and this must be fixed. A goodwill repair assistance, or a broader recall initiative would show some integrity.
The contact owns a 2014 Mercedes-Benz E-350. The contact stated that while the vehicle was parked and occupied, the contact heard an abnormal rattling sound coming from the engine that lasted for approximately 3 seconds when first started. An independent mechanic was contacted. The vehicle was taken to an independent mechanic, and the contact was informed that the failure was a common issue, and that the vehicle operated as designed. The contact stated that the failure might be related to the timing chain or the lifters. The contact stated that there were no issues while driving the vehicle, only whenever the vehicle was first started. The contact stated that after the engine had warmed up to operating temperature, the sound was no longer heard. The vehicle was not repaired. The manufacturer was notified of the failure and advised the contact to report the failure to the NHTSA Hotline. The approximate failure mileage was 140,000.
Engine camshaft position sensors are leaking oil which has "wicked" into the engine wiring harness and ECU. This is a common safety issue on this year and I would like to urge Mercedes to issue a recall as oil contamination within the electrical system can lead to a host of other safety concerns.
I brought in my car to M1 Mercedes, Fremont, CA for service after “check engine” light was on and running rough on idle. I told them I started using ethanol (E85) fuel recently but my car is spec for that. The shop replaced spark plugs and ignition coils but the issue didn’t go away. While the car is parked overnight at the shop garage, on Jun 21, 2022, around 11pm, the engine exploded. The incident was caught on camera by the shop. The intake manifold was blown open. The car was tolled to Fletcher Jones Mercedes Fremont, CA (authorized Mercedes dealer) for diagnostic. However, they didn’t offer any solution or attempt to find out what caused the explosion. They offered to replace the intake manifold for $1200. I declined as I believe this is a serious safety issue. What happen if it explodes again? Since the cause of the explosion is not found and address. It could happen again anywhere, anytime. Fletcher Jones Fremont charged me $265 for labor and I tolled my car back home. I attempted to contact Mercedes USA via their website to alert them about this problem and seek resolution. However I never hear back from them. I hope you can help to look into this serious safety issue. Attached please find the blown intake picture and report from M1 Mercedes. I have the explosion video as well.
CAR WAS PURCHASED FROM MERCEDES DEALERSHIP IN 2016 AND HAS ONLY BEEN SEEN BY MERCEDES DEALERSHIPS FOR SERVICE. IN 2019, A OIL SEEPAGE WAS NOTED DURING ANNUAL MAINTENANCE HOWEVER NO REPAIR OR DIAGNOSIS WAS PERFORMED. AT THIS TIME, THE CAR ONLY HAD 36,000 MILES ON IT. IN NOV OF 2020, THE CAR WAS TAKEN IN TO THE SAME DEALERSHIP FOR ANNUAL SERVICE. THE CAR NOW ONLY HAD 40,000 MILES BUT WAS GIVEN A 50K SERVICE. AT THE TIME OF SERVICE, THE TECHNICIAN EXPLAINED THAT OIL WAS LEAKING FROM THE ENGINE COVER AND HAD ALSO CONTAMINATED THE DRIVE BELTS. REPAIRS TO ENGINE COVER, BELT AND TENSIONER CAME TO $3000+. DEALERSHIP HAD NO EXPLANATION FOR WHY AFTER SUCH A SHORT TIME WITH LIMITED DRIVING, THE CAR HAD SUCH SIGNIFICANT REPAIRS NEEDED. A TIRE PRESSURE SENSOR HAD ALSO FAILED. FROM MY RESEARCH THIS ISSUE IS KNOWN, HOWEVER SHOULD NOT BE HAPPENING TO A CAR BEGINNING ONLY 5 YEARS AFTER OF MANUFACTURING WITH LESS THAN 37,000 MILES.
TL* THE CONTACT OWNS A 2014 MERCEDES BENZ E-350. THE CONTACT STATED THAT THERE WERE HIGH TEMPERATURE EMISSION FUMES COMING INTO THE ENGINE AND PASSENGER COMPARTMENTS. A MISSING BOLT THAT HOLDS THE EMISSIONS PORTIONS THAT ROUTS THE EMISSION FUMES OUT OF THE VEHICLE. THE ENGINE COMPARTMENT NOW HAD DAMAGE OF BURNED INSTALLATION, MELTED ELECTRICAL WIRING AND COMPONENTS AND THE FIRE WALL ALL HAVING TO BE REPLACED. THE DEALER (MERCEDES-BENZ OF WEST HOUSTON 1025 HIGHWAY 6 N, HOUSTON, TX 77079 (281) 492-5800) HAVE THE VEHICLE AND WERE PERFORMING THE REPAIRS. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 84,579.
MERCEDES DEALERSHIP INFORMED ME THAT THE REAR MAIN SEAL OF MY AUTOMOBILE IS LEAKING AND COULD BE EXTREMELY DANGEROUS. THEY HAVE REFUSED TO CORRECT THIS SAFETY VIOLATION. THEY HAVE TO PULL THE ENGINE TO CORRECT IT. THIS LEAKAGE COULD CAUSE A FIRE CAUSING LOSS OF LIFE. I WAS INFORMED THE DEALER WOULD REPAIR THIS FOR ANYONE DRIVING A 2014 DIESEL AUTO. SINCE LESS THEN 3% OF CARS ARE DIESEL POWERED THIS IS OBVIOUSLY A WAY FOR MERCEDES TO AVOID REPAIRS. THEY STARTED REPAIRING THIS PROBLEM IN DIESEL CARS BEFORE MY WARRANTY EXPIRED. I HAVE BROUGHT MY MERCEDES IN FOR REGULAR MAINTENANCE CHECKS. IT IS OBVIOUS THAT THE COMPANY IS TRYING TO AVOID LOSSES RATHER THAN REPAIRING SAFETY PROBLEMS. MY AUTO WAS PURCHASED BRAND NEW. I AM WORRIED ABOUT MY LIFE AND MY CHILDREN. THIS IS GROSS NEGLIGENCE AND COULD LEAD TO LOSS OF LIFE IF NOT CORRECTED.
FOOT ON BRAKE TO EFFECT REVERSE AND THE ENGINE ACCELERATED AT HIGH SPEED UNCONTROLLED AND HIT TWO CARS IN REVERSE AND TOTALLY DESTROYED MY CAR.. THE VEHICLE WAS STOPPED IN A PARKING LOT
CUSTOMER RAN CAR OUT OF OIL DESTROYING ENGINE AND TURBO'S TOTAL COST OF REPAIR IS 25,000
DRIVING THE CAR AT 45 MPH AND THE DISPLAY MESSAGES COME ON THAT STATED, "PRE SAFE FUNCTIONS LIMITED, INOPERATIVE" IN ADDITION, THE ESP AND ABS WARNING LIGHTS ILLUMINATED. THE VEHICLE LOSES POWER AND HAS VERY LIMITED ACCELERATION. IT HAS OCCURRED TWICE, ONCE ON CITY ROAD AND ONCE ON HIGHWAY AT 55 MPH. SHUTTING AND RESTARTING THE CAR ELIMINATES THE PROBLEM FOR THE TIME BEING. IF THIS HAPPENS AGAIN AND I AM UNABLE TO PULL OVER SAFELY, IT WILL BE A LIFE-THREATENING EMERGENCY. I WILL BE REAR-ENDED AT HIGH SPEEDS BY TRAFFIC BEHIND ME. AFTER THE FIRST INCIDENT, I TOOK IT TO DEALER AND THEY ADJUSTED COMPUTER. THE SAME EXACT THING HAPPENED JUST 4 DAYS LATER. THIS HAS THE POTENTIAL TO CAUSE MASSIVE FATALITIES SIMILAR TO THOSE IN THE GM DEBACLE. I SEE THIS HAS ALSO BEEN REPORTED AS A PROBLEM IN THE 2014 CLA 250 MODELS. *JS
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 25, 2026