2017 Mercedes-Benz C300: gas smell in the cabin

Filed May 5, 2026 · Fuel system · FL

strong evident fuel/ gas smell when driving and when the car is in park after driving.

Filed Dec 31, 2025 · Fuel system · FL

UNKNOWN it was just one day I started my car and turned the A/C on and I started getting this strong gasoline smell. I went on like a saw there is a recall for this problem for the M274 engines.

Filed Oct 21, 2024 · Engine, Fuel system · TX

my whole entire car smells like gas. I cannot drive this car around because I will pass out and it is a safety hazard. There is a recall for this exact same issue, just not for my Vin number. I would like to get this done for my car, please.

Filed Jan 21, 2024 · Fuel system · MA

During cold starts the fuel injectors/clamps leak causing strong gasoline smell inside the cabin. After research online this is a common issue with W205 systems. I am beyond surprised this has not been investigated and reported as a safety recall as it can pose a fire hazard. Please investigate and Mercedes should be fixing this issue….

Filed Jan 2, 2024 · Fuel system · NV

every winter this car will have a heavy smell of gas in the engine and the cabin, after driving it for around 15 minutes with the windows open in the cold it goes away. no problem in the summer time. My mechanic said it's a common problem with these cars.

Filed Dec 19, 2023 · Fuel system · NY

There is a short rubber fuel line/hose in the engine compartment that is attached with compression clamps; the hose connects the fuel line from the gas tank to the high pressure fuel pump. When it gets cold outside (below ~40 degrees Fahrenheit) the clamps loosen a bit and the hose will leak gas The entire interior smells like gasoline, really bad.

Filed Oct 31, 2023 · Fuel system · MD

I have a 2017 C 300 and it smells like gas when I turn my heat/ac on. I contacted Mercedes to see if there was a recall as this is a huge issue with many customers but Mercedes offered no assistance. The smell of gas is very dangerous and I think it's unfair to the customers that Mercedes has known about this problem but chose to do nothing.

Filed Feb 13, 2023 · Fuel system · NH

My preowned vehicle has a strong gas odor in the cabin while operating. I don’t see any safety recalls but I did read online that a class action lawsuit proved my model may have faulty fuel parts causing seepage and the watranty is extended to 10yr/120k miles. I have scheduled maintenance this week but would like to be certain the warranty will cover this. Thank you.

Filed Jan 9, 2023 · NJ

Check engine light code " P052E71" Crankcase Ventilation Valve Replacement is needed. There is a defective part oil separator and the valve is stuck. Must replace the whole assembly with the hoses. (Part is available for inspection). The problem has been confirmed by the Mercedes dealership. When starting the car, gas fumes come out and is very distinct in the air which is VERY dangerous in confined spaces as well as around other people. . You will fail emissions testing due to this. The repair will cost between $1600 - $2000. This is a know defect in these cars and should be recalled. It also pollutes the air and put the safety of everyone around in danger.

Filed Oct 25, 2022 · Engine · CA

ode P052E : Positive Crankcase Ventilation Regulator Valve Performance. This seems to be a common problem with the C300.It's not an easy fix. MB hasn't addressed this common issue. Also strong smell of gas coming into the cabin during start up. Took car to Keys Van Nuys Mercedes in North Hollywood and was no recall. We are inhaling these fumes and they blamed it on a hose that expands and fumes escape into the cabin. Wanted to charge for the repair but I refused.

Filed Sep 17, 2022 · Fuel system · CT

Please see attached letter: [XXX] Mercedes Benz Crankcase Valve Claim.pdf, repair estimate and other correspondence from Mercedes-Benz. This is an well-known issue where there is a gas lead from the engine where Mercedes insists doesn't pose a safety issue. During cold starts there is a smell of gas in the cabin and this is prevalent in colder climates like New England. Mercedes should make cars for all markets that are safe. INFORMATION Redacted PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).

Filed Feb 23, 2022 · Engine, Fuel system · WA

When starting the car in the morning there is fuel smell that gets into the cabin. Additionally, as the car is idle during the drive, the smell of fuel is very obvious. Windows have to be rolled down to avoid the smell