What 300 owners told NHTSA about the 2014 Mercedes-benz E-class Wagon

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).

NHTSA ODI 11723123

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.

NHTSA ODI 11685698

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.

NHTSA ODI 11602721

My 2014 Mercedes started getting a fault light with multiple performance issues. Mercedes dealer where I can carry out my routine maintenance diagnosed the issue to the electrical harness being contaminated with engine oil and it needed to be replaced on the engine because of a known issue whereby oil from the upper camshaft sensors seep into the harness and makes its way to ECU and causes possible failure of the engine control, which could lead to shutting down or worse, incorrect engine timing which would lead to incorrect detonation at the compressors and subsequently engine failure at critical operational phase. This below link and attached document describes the issue well. [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI 11584134

Motor mounts and transmission mounts continue to fail at intervals or 13,000 miles and again at 16,000 miles. Vibration of transmission is scary. Mercedes has replaced the mounts many times. They refuse to install new Transmission mount now after only 16,000 miles on the replacement. I have contacted MBUSA and they are telling me , they will not help with these substandard parts. Very well-known issue.

NHTSA ODI 11538058

I own a 2014 E350 mercedes benz the transmission was recalled a while back but long story short my car has all the same exact problems a lot of e350 owners are having with the conductor plate witch causes rough shifts between 1st and 3rd gear car went to Mercedes’ for more testing now I’ve got a 13000 dollar estimate and problem is even though the vin doesn’t show it was recalled for that reason the problem is spread world wide cuz my car only has 60000 miles and every one’s Mercedes’ is giving same exact problems not just mine so it has to be a recall

NHTSA ODI 11497357

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.

NHTSA ODI 11487246

Car was being driven at secondary road speed (~40MPH). Engine suddenly began to spudder and misfire terribly. Came to a stop light engine was idled roughly. Accelerated from stop, when check engine light turned on. Car went into limp MODE at a very dangerous rail road crossing and left turn intersection. Without acceleration, family was in danger of being hit by train and incoming traffic. Took car to Mercedes mechanic. Faulty parts were the Camshaft Position Solenoid valve, ignition cool. Short circuit in one part caused blown ignition fuse and cascading mechanical problems and safety risks. Repair cost so far is $1,100. Concern is the placement of the faulty part. It is exposed to high heat in the motor compartment and poses a fire hazard as well as a personal injury hazard to the occupants and driver.

NHTSA ODI 11477325

Mercedes Benz had a previous recall Campaign # 2009100001 which affected vehicles until 2012 and mine is a 2014 model E350. It has the same issue with Engine severely misfiring and jerky on the road as if it is going to STOP IN THE MIDDLE OF FREEWAY while driving and cause a SAFETY RISK for my family and others on the road. Specific component is Oil leaks from transmission wiring harness and ECM connector. The leak is from camshaft hall sensors and transmission drain plug. Mercedes Benz dealer in Pleasanton, CA has confirmed the issue after I paid $218 for diagnosis.

NHTSA ODI 11438188

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.

NHTSA ODI 11375166

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.

NHTSA ODI 11360917

WHILE DRIVING THE VEHICLE AT 40MPH ON A CITY STREET, ALL WARNING LIGHTS SUDDENLY CAME ON AND THE MOTOR STALLED. THE VEHICLE LOST ALL STEERING, BRAKING AND SPEED CONTROL. THE VEHICLE HAD TO BE REMOVED FROM THE ROAD BY A TOW TRUCK. IT WAS A DANGEROUS SITUATION AS THE VEHICLE LOST ALL CONTROLS WHILE IN MOTION. THE VEHICLE WAS LOCKED IN PARK AND DASH WARNING OF "PRE-SAFE CONDITIONS, DO NOT SHIFT."

NHTSA ODI 11353696

TL* THE CONTACT OWNS A 2014 MERCEDES E-350. WHILE DRIVING 60 MPH, THE VEHICLE MADE AN ABNORMAL BUMPING NOISE COMING FROM THE ENGINE WITHOUT WARNING. THERE WERE NO VISIBLE LEAKS. THE VEHICLE WAS TAKEN TO MERCEDES-BENZ OF PEMBROKE PINES (14199 PINES BOULEVARD, PEMBROKE PINES, FL 33027, (954) 644-5035) WHERE IT WAS DIAGNOSED THAT THE TRANSMISSION AND RADIATOR NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE AND PROVIDED THE CONTACT WITH CASE NUMBER: [XXX] THE MANUFACTURER STATED THAT THEY WOULD LOOK INTO THE FAILURE. THE FAILURE MILEAGE WAS 85,000.*DT *TP 'PARTS OF THIS DOCUMENT HAVE BEEN REDACTED TO PROTECT PERSONALLY IDENTIFIABLE INFORMATION PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).'

NHTSA ODI 11267113

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.

NHTSA ODI 11235302

CUSTOMER RAN CAR OUT OF OIL DESTROYING ENGINE AND TURBO'S TOTAL COST OF REPAIR IS 25,000

NHTSA ODI 11164710

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

NHTSA ODI 11163323

WHILE DRIVING ON THE HIGHWAY, I ATTEMPTED A HEAVY ACCELERATION TO GET THE CAR UP TO TRAFFIC SPEED. TWO TIMES IN THE PAST 60 DAYS, THE CAR SERIOUSLY MALFUNCTIONED WITH MULTIPLE DASHBOARD INDICATOR LIGHTS AND THE MAIN TEXT "PRE SAFE FUNCTIONS LIMITED" ACCOMPANIED BY A TOTAL LOSS OF SPEED CONTROL. THE ACCELERATOR BECAME 100% UNRESPONSIVE AND I HAD TO COAST TO AN EMERGENCY LANE. THERE WAS SIGNIFICANT DANGER IN BOTH INSTANCES AS I HAD TO CROSS MULTIPLE LANES OF TRAFFIC WITH NO POWER TO GET TO SAFETY. THE WEATHER WAS CLEAR AND THE EXTERNAL SENSORS WERE NOT OBSTRUCTED BY DIRT OR SNOW- WHICH HAS PREVIOUSLY CAUSED THE PRE-SAFE FUNCTIONS LIMITED MESSAGE. I BELIEVE THAT THE MULTIPLE ERRORS INDICATED ON THE DASHBOARD ARE ALL ERRONEOUS TO THE CORE ISSUE OF A SUDDEN AND TOTAL LOSS OF POWER UPON HEAVY ACCELERATION. THE RESOLUTION WAS TO SHIFT THE CAR INTO PARK, PUSH THE IGNITION BUTTON AS IF TURNING THE VEHICLE OFF, WAIT AND RESTART. THE CAR OPERATES NORMALLY UPON RESTART. NOTE THAT THE ENGINE APPEARED TO ALREADY BE OFF PRIOR TO SHIFTING INTO PARK. IT IS AS IF THE HEAVY ACCELERATION KILLED THE ENGINE. THIS ISSUE HAS POTENTIAL FATAL CONSEQUENCES IF THE DRIVER IS UNABLE TO GET THE CAR OUT OF THE LANE OF HIGH SPEED TRAFFIC-- AS I WAS IN. A LESS EXPERIENCED OR PANICKED DRIVER COULD EASILY FAIL TO HANDLE THE SITUATION AND GET REAR ENDED AT HIGH SPEED AS THE CAR CAN ONLY BE RESET BY GETTING IT INTO PARK AND RESTARTED. SIMILAR BLOG POSTS ONLINE REPORT THE SAME WITH OTHER MERCEDES VEHICLES. I HAVE HAD THE CAR FOR FOUR MONTHS AND IT HAS HAPPENED TWICE. SEEMS LIKE A SOFTWARE/ELECTRONIC ISSUE CAUSING THE MECHANICAL ISSUE TO ME. VERY DANGEROUS.

NHTSA ODI 10839989

THE CAR HAS A ECO SYSTEM WHICH MAKES THE ENGINE STOP WHEN YOU COME AT COMPLETE STOP TO SAVE FUEL. WHEN THE INCIDENT HAPPENED, THE CAR STARTED WITH A HUGE JERK AS IF THE GEAR BOX IS BROKEN. NOW IT IS GIVING TWO DIFFERENCE MESSAGES: 1. AUXILIARY BATTERY MALFUNCTION 2. PRE-SAFE FUNCTIONS LIMITED (SEE OPERATOR'S MANUAL) THE CAR IS JURKING HEAVILY. I TOOK IT TO MERCEDES DEALER IN PLEASANTON, CA. THE SERVICE AGENT ASKED ME IF I BOUGHT THE VEHICLE FROM THEM. I TOLD THAT I DID BY AN S550 FROM THEM BUT NOT THIS ONE SINCE THEY DIDN'T HAVE THE SPECIFIC FEATURE WHICH I NEEDED HENCE I WENT TO SAN JOSE MERCEDES BENZ WHO HAD THE VEHICLE WHICH HAD ALL THE FEATURES OF MY CHOICE. SHE THEN TOLD ME THAT IT IS PRETTY SAFE TO DRIVE AND THAT THEY DON'T HAVE TIME AND SLOT TO CHECK THE VEHICLE AND I HAVE TO MAKE AN APPOINTMENT TO GET IT CHECKED. I TOLD THEM THAT "AS LONG AS IT IS SAFE TO DRIVE, I AM NOT WORRIED, HOWEVER, TO ME IT IS QUITE UNSAFE". DUE TO THIS ISSUE, I WAS PARKING THE CAR IN A PARKING LOT OF 76 GAS STATION, THE CAR ENGINE STOPPED WHEN I APPLIED THE BREAK IN THE PARKING LOT. I WANTED TO PARK IT RIGHT SO AS I PULL MY FEET FROM THE BREAK, THE CAR JURKED AND HIT THE FRONT GUARD FROM RIGHT SIDE TO THE FRONT PARKING (CONCRETE STOPPER) STOPPER. I HAVE TO SHOW IT TO THE DEALER DURING MY APPOINTMENT ON WEDNESDAY.

NHTSA ODI 10733426

I WAS TRAVELING ON HIGHWAY 26 AT APPROXIMATELY 60 MPH GETTING READY TO MERGE ONTO HIGHWAY 526, WHEN THE ENTIRE DIGITAL WARNING PANEL LIT UP AND THEN WENT DEAD, WITH THE ENGINE INOPERABLE LIGHT COMING ON AND ASKING ME TO REFER TO THE OWNERS MANUAL. ALL POWER WAS CUT FROM THE GAS PEDAL AND I WAS LUCKY ENOUGH TO BE ABLE TO COAST TO A VERY SMALL STRIP OF MEDIAN WITHOUT BEING HIT BY ANY OTHER VEHICLES. THIS IS A VERY HEAVILY TRAFFICKED AREA AND CHARLESTON BEING A PORT CITY I WAS VERY FORTUNATE THAT THE TRUCKS THAT WERE AROUND ME WERE ABLE TO AVOID HITTING ME. IF I HAD BEEN IN ANOTHER SITUATION, SUCH AS PULLING OUT INTO TRAFFIC OR TRYING TO CROSS OVER A TWO LANE HIGHWAY THE RESULTS COULD HAVE BEEN CATASTROPHIC TO SAY THE LEAST. I HAVE BEEN TOLD BY THE DEALER THAT THERE WAS A BULLETIN ISSUED INVOLVING THE THROTTLE VALVE ACTUATOR, TOPIC # LI54.18-P-058597, VERSION 9. THEY HAVE NOT BEEN ABLE TO TELL ME WHY THIS HAPPENED IN THE FIRST PLACE, CANNOT GUARANTEE IT WILL HAPPEN AGAIN AND I WOULD LIKE TO KNOW WHY THERE WAS NOT A RECALL FOR THIS PARTICULAR POTENTIALLY LIFE THREATENING ISSUE? SINCERELY, [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6). *TR

NHTSA ODI 10713398

WHILE DRIVING ON A SIDE STREET LOOKING FOR AN ADDRESS, A WARNING MESSAGE APPEARED SOMETHING LIKE "LANE GUIDANCE SYSTEM INOPERATIVE". SUBSEQUENTLY, THE ENGINE LOST POWER AND WOULD NOT MOVE THE VEHICLE MORE THAN ABOUT 3 MPH. WE PULLED OFF TO THE SIDE, NOT KNOWING WHAT TO DO. I SHUT OFF THE ENGINE AND RESTARTED IT AND IT APPEARED TO WORK NORMALLY FOR THE REST OF THE TRIP HOME. WE WONDER WHAT WOULD HAVE HAPPENED IF WE HAD BEEN IN A MIDDLE LANE ON A FREEWAY WHEN THIS HAPPENED. I PLAN ON CONTACTING THE DEALER TODAY FOR MORE INFORMATION AND TO HAVE THEM INSPECT THE CAR. *TR

NHTSA ODI 10702888

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

NHTSA ODI 10662055

WAS DRIVING ON 95N AROUND 65 MPH WHEN VEHICLE LOSES POWER !!! I WAS IN THE LEFT HAND LANE AND TRAFFIC WAS FLOWING. IT WAS BY THE GRACE OF GOD THAT I MADE IT TO THE RIGHT SHOULDER WITHOUT CAUSING A MAJOR ACCIDENT FOR MYSELF AS WELL AS FOR OTHER VEHICLES. THE ENGINE LIGHT CAME ON AND THE ANTI SKID AND ANTI SKID OFF LIGHTS CAME ON ALSO IT SAID CONSULT OWNERS MANUAL. THE VEHICLE IS BRAND NEW AND I NEVER WANT TO DRIVE IT AGAIN!!!. AFTER I STOPPED I CUT THE VEHICLE OFF AND RESTARTED THE VEHICLE TO TRY AND GET HOME. ON THE WAY HOME IT DID IT THREE MORE TIMES. I COULD HAVE KILLED MYSELF AND MY DAUGHTER ALSO WHO EVER ELSE WAS ON THE ROAD. ONCE I GOT HOME I WAS REALLY PISSED AFTER READING ABOUT ALL THE OTHER BENZ OWNERS THAT HAD THE EXACT SAME PROBLEM. THIS IS TERRIBLE FOR A BRAND NEW MERCEDES !!!!!! *TR

NHTSA ODI 10661372

I HAVE A 2014 MERCEDES BENZ E250 DIESEL, I COMPLAINED THAT THE ENGINE HESITATES WHEN TRYING TO ACCELERATE, I WAS TOLD THAT THE TRANS AND ENGINE HAS TO GET USED TO MY DRIVING HABITS,,,LOL....IT'S STILL DOING IT, ALSO THE SUSPENSION ON THE 2014 IS HORRIBLE U CAN FEEL EVERY BUMP, CRACK, POT HOLE, I TOOK IT BACK TO THE DEALER THEY SAID THERE IS NOTHING WRONG WITH THE SUSPENSION, I WAS DRIVING ON I-95 HIT A POT HOLE FOR THE COST OF THIS CAR AND THE BENZ REPUTATION, IT SOUND LIKE I CRASHED INTO A WALL AND ALMOST LOST CONTROL OF THE VEHICLE, IT FELT LIKE THE FRONT OF THE CAR FELL OFF I HAD A 2006 ECLASS, AND THE 2014 IS NOTHING LIKE IT, IT'S CHEAP, DRIVES LIKE A 50 YEAR OLD CAR, DON'T BUY IT. *TR

NHTSA ODI 10660590