What 19 owners told NHTSA about the 2021 Mercedes-benz E-class Wagon

Engine keeps having a misfire that Mercedes put a TSB out for and once the misfire happen I cause the vehicle to go in a limp mode which causes the vehicle to loose power happened to me in the freeway. The car had 54K miles and Mercedes refused to repair the issue as the engine part failure isn’t common.

NHTSA ODI 11707258

My 2021 Mercedes-Benz E350 (VIN [XXX] ) developed a serious engine issue involving cylinder misfire and check engine light. The dealer diagnosed it as a leaking exhaust valve on cylinder 4, related to TSB LI01.30-P-072328, which documents valve seat wear in M260 engines. This is a known defect acknowledged by Mercedes in technical bulletins, and other customers in the U.S. have received warranty extensions or goodwill coverage. I was denied coverage even though this is a manufacturer defect that can lead to misfire, power loss, and potential stalling, posing a safety risk on the road. Mercedes-Benz USA refuses to cover the repair (~$7,600+), even though it relates to a factory-documented problem. I’m requesting that NHTSA investigate this engine defect, as it may qualify for a safety recall or mandatory extended warranty coverage. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI 11673376

FIRE FIRE FIRE Information light came on just saying 12 Volt Battery. I sat in the car letting it idle for about 3 minutes. It began to smoke and then burst into flames. I called 911 got the fire department here but by the time they were here there was not much left. The car essentially burned to the ground and insurance has declared it a total loss. Car was in my driveway, was certainly a danger to me, to my house and to my neighbor's cars and house.

NHTSA ODI 11629406

The engine is misfiring and not powering correctly during driving. Car is failing to take off and today almost caused an accident due to the car would not pull off from the traffic light with oncoming traffic due to loss of power. Safety was at risk due to an accident was almost caused due to car not moving in on coming traffic Dealership is citing that is needs to have a cylinder replaced but will not tell me why it needs to be replaced, why this has happened or what could have been done pre maintenance to avoid this issue Check engine light came on Dealer has been contacted, and was told this is a common issue for this to happen to newer cars, but will not fix the issue and extended warranty will not cover due to this is a manufacturer issue

NHTSA ODI 11571057

The 48 volt battery on this mild hybrid vehicle failed and the car was unable to be started on May 3, 2021, with 196 miles on the odometer, a mere 15 days after delivery. It had to be taken by flatbed to the dealer where ultimately the 48 volt battery was replaced. Then again on June 5, 2021, the car was again unable to be started, with a mere 735 miles on the odometer. Again, the car had to be taken by flatbed to the dealer, where ultimately the 48 volt battery was replaced a second time. While both failures, fortunately, happened while the vehicle was at home, the could have happened on the highway, in the middle of nowhere in bad weather conditions, or anywhere. I have had to cancel a cross-country drive for fear that, once again, the 48 volt battery will fail, leaving us stranded anywhere or, worse yet, in the middle of a highway.

NHTSA ODI 11441712

I BOUGHT THIS CAR ON 12/12/2021 AND TWO WEEKS AFTER THAT, THE CAR HAD WARNING MESSAGE ON DASHBOARD "COOLANT TOO HOT, STOP THE VEHICLE" ON THE HIGHWAY -NJ TUNPIKE. IT STARTED SLOWING DOWN ON ITS OWN TO BELOW 20MPH, NEARLY KILLED ME WHILE I TRIED TO PULL IT OVER. THEN THE DEALER SERVICE SAID IT HAD DEFECTIVE WATER PUMP. THEN LAST WEEK 4/13/21 - 4 MONTH,ABOUT 2800 MILEGE ON IT, IT WOULDN'T START AT ALL., JUMP START DIDN'T EVEN WORK. SO I WAS STRANDED AGAIN IN THE MIDDLE OF THE NIGHT. IT GOT TOWED AND THEY SAID IT HAD DEFECTIVE BATTERY. SO HOW MANY DEFECTIVE PARTS THIS CAR HAS. IT WILL KEEP BREAKING DOWN AND THREATEN MY LIFE ON THE HIGHWAY WHERE I COMMUTE EVERY DAY IN THE NIGHT TIME. THEY SHOULD TAKE THIS CAR BACK AND REPLACE BUT THE DEALER REFUSED BECAUSE IT HAD PROBLEMS ON DIFFERENT PARTS AND FIXED. BUT THIS VEHICLE IS PIECE OF JUNK AND A RISK TO NOT ONLY MY LIFE BUT ALSO O THER DRIVERS ON THE HIGHWAY BECAUSE IT DOES THINGS ON ITS OWN WAY, I HAD NO CONTROL OVER THE CAR AT ALL.

NHTSA ODI 11413260