Which parts fail
Components named in complaints (fuel pump, injectors, fuel tank, hybrid and EV propulsion).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2017 Mercedes-Benz E300 owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2017 Mercedes-Benz E300. The contact stated that the vehicle was purchased on October 20, 2023. The contact stated that when she entered the vehicle the following day, the exterior of the vehicle smelled of gasoline. The contact stated that the fuel odor had become so abnormally strong inside the vehicle, causing her mother's asthma to flare up. The vehicle was taken to the dealer. The vehicle was diagnosed with a low-pressure and high-pressure fuel line leak in the engine compartment. The contact was informed that the fuel line and fuel pump needed to be replaced. The vehicle was not repaired. The dealer advised the contact that the parts to complete the repair were ordered. The manufacturer was not made aware of the failure. The failure mileage was approximately 31,806.
The contact owns a 2017 Mercedes-Benz E300. The contact stated while driving approximately 35 MPH, there was an abnormal gasoline odor entering the vehicle. The contact stated that he did not notice a warning light being illuminated. The contact had taken the vehicle to a local dealer who was unable to determine the cause of the failure. The contact then drove the vehicle to an independent mechanic who diagnosed the vehicle and determined that the fuel rails and fuel injectors needed to be replaced. The vehicle had not been repaired. The independent mechanic advised the contact that the failure was related to NHTSA Campaign Number: 21V961000 (Fuel System, Gasoline). The manufacturer had been informed of the failure. The failure mileage was approximately 68,000.
The contact owns a 2017 Mercedes-Benz E300. The contact stated while driving at an undisclosed speed, the contact noticed gasoline odor inside the vehicle. The vehicle was taken to an independent mechanic where it was diagnosed with a fuel leak. The contact was informed that the fuel rail and fuel injector needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The contact was informed of NHTSA Campaign Number: 21V961000 (Fuel System, Gasoline); however, the VIN was not included in the recall. The contact was advised to contact the NHTSA Hotline to report the failure. The failure mileage was approximately 72,100.
The contact owns a 2017 Mercedes-Benz E300. The contact stated that while driving at an undisclosed speed, there was a strong gasoline odor entering the vehicle through the vents, and the odor was on the interior and exterior of the vehicle. No warning lights were illuminated. The vehicle was taken to the dealer for an oil change; however, the vehicle was not inspected or repaired. The contact stated that the failure persisted. The contact related the failure to NHTSA Campaign Number: 21V961000 (FUEL SYSTEM, GASOLINE); however, the VIN was not included. The manufacturer was not notified of the failure. The failure mileage was approximately 59,000.
The contact owns a 2017 Mercedes-Benz E300. The contact stated while driving at an undisclosed speed, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended. Additionally, the vehicle stalled, and the engine misfired. The contact stated that the check engine warning light was illuminated. The vehicle was taken to the dealer where it was diagnosed with failed fuel injectors and failed fuel rail. The contact was informed that the fuel injectors and the fuel rail needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 72,000.
There was a smell of gasoline in and outside the car when the car was idling. Also, a smell of gasoline in the garage around the parked car. Also a smell of gasoline after starting the car, that went away after driving. I called the service department. They gave me an appointment one week later. I have no complaints about the service dept. When the car was repaired several hours later, the report stated "found seep at fuel hose to pump", and then, "replaced upper fuel hose to high pressure fuel pump". They told me it was no charge because they knew about this problem happening in their vehicles and had extended the warranty for it. I was/am very concerned because(1.) if I had been in an accident, could have more easily been a fire? …
Vehicle emits a strong odor of gasoline when cold. It was mainly noticeable on the outside of the car at first, but now when I turn on the air inside the car (not on AC mode), I started smelling the odor of gas in the cabin. I have taken the car for possible repairs, but am told on two separate occasions by an independent service center that the odor can not be duplicated. There are recalls for the same issue on different models, but as of yet, not on this particular year model. I have notice that when the car sit overnight and when I open any door, trunk or push the lock button on the car's remote, a few seconds later, it starts emitting the smell of gasoline. The car is always parked overnight inside my garage, hence the smell is very strong.
There are three main issues: As the weather got cold here in NJ, whenever the car is started in the morning, there is a strong fuel smell inside the cabin. Also there is a lot of fumes that smell gasoline. I think it is safety issue. The auto braking does not seem to operate right. I do not see any error message, but it had never tried to avoid a collision when I have tried other cars that would have normally applied the brakes in those situations. The garage door opening function does not work as soon as the ignition is turned off. This is an electrical issue in my view.
malfunctioning positive crankcase ventilation (PCV) valve: Issue: The partial-load ventilation valve in the intake line assembly does not work as intended, causing the check engine light to come on. Recommended action: the intake line assembly may need to be replaced. A malfunctioning positive crankcase ventilation (PCV) valve can cause a number of engine issues, including: Increased oil consumption, Leaks, Reduced fuel efficiency, and The engine releasing more pollutants.
The car is running poorly. Smell of fumes inside the car. Not drive able due to risk of engine damage including fires and exposure to dangerous fumes. Part is on back order and that is not a guarantee that the part will not fail again after fixed. Many people report continual replacement of the part. Positive Crankcase Ventilation Regulator Valve Performance: The valve for crankcase ventilation has a malfunction. Crankcase ventilation actuator is blocked .
Related recalls
Fuel system, gasoline › Delivery › Fuel pump
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain model year 2017 E300 Sedan and E300 Sedan 4Matic vehicles manufactured December 10, 2015, to June 30, 2016. In the affected vehicles, the rear bench seat frame may contact and damage the wiring harness for the fuel pump, fuel tank pressure sensor or fuel level gauge.
Remedy: MBUSA has notified owners, and dealers will modify the routing of the affected wiring harness, repairing it as necessary, free of charge. The recall began October 28, 2016.
Fuel System complaints in other E300 years
Frequently asked questions
How common are fuel system problems on the 2017 Mercedes-Benz E300?
NHTSA has 25 complaints about the fuel & propulsion system of the 2017 Mercedes-Benz E300, 19% of the model year's 132 complaints. The component named most often is delivery › fuel pump (1 mentions).
Is there a recall for 2017 Mercedes-Benz E300 fuel system problems?
Yes — NHTSA recall 16V-758 (fuel pump, Oct 19, 2016). Recall repairs are free at authorized dealers.
At what mileage do 2017 Mercedes-Benz E300 fuel system problems start?
Half of the complaints with a recorded mileage happened before about 59,000 miles, and 11% before 25,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.