I have a problem that happened with a trouble code: P052E. It appears for now reason so the problem is in a faulty positive crankcase ventilation regulator valve. It costs a lot and not all the mechanics can do this type of work.

- Cedar Park, TX, USA

Engine misfire, rough idle, shake when come to red light stop, burnt smell inside cabin, loss of power

- Sherman Oaks, CA, USA

Check engine light P052E, PVC valve. Dealer wants $2,500 for this repair and people are complaining that around 30k-50k it does it. Thats ridiculous. My dealer said its a common issue but Mercedes is not issuing a recall.

- Troy, MO, USA

The PCV Valve/crankcase has broken 3 times on this car with different repairs and parts. This is happening very commonly to these cars and may cause significant safety issues. The code is P052E

- Providence, RI, USA

My car failed smog test due to code P052e positive crankcase ventilation regularly valve. Upon some research, I found that this is very common issue with this car. The repair costs +$2000 before tax at the dealership. Please consider this complain as this issue is very common with this make model and unfortunately many drivers don-??t realize that it-??s due to faulty system.

- San Diego, CA, USA

my engine light came on. When I took the car to get diagnosticated message P052E showed.

- Townsend, DE, USA

PCV Valve causing contamination and shortening the life of the engine oil.

- Frederick , MD, USA

Check engine light keeps coming on and off.

- Oakland, CA, USA

I bought the car with 51k miles. Engine failed at 71k miles, due to piston #1 cracking. Almost caused me to get rear ended on a busy street. I went to the dealership and they charged me $10250 to replace the engine with a remanned long block and they offered a 2 year warranty. 9 months, only 19k miles on -??new motor-?? the -??new-?? engine fails again -?? same reason piston # 1 cracked failed suddenly on the highway and I had to push the car to safety to the emergency lane while cars where coming.. I went back to dealer demanding a replacement and told them this is a common occurrence and they refused to help me. I called corporate. They refused to help me saying I would have to purchase an engine for the second time out of pocket when it only lasted 9 months. This is a big fault in the m274 engine -?? it-??s also a safety hazard that can cause serious injury, fire, or even a deadly accident. I read that it-??s a common issue with these engines.

- Sioux Falls, SD, USA

Check engine light appeared this morning, had the code scanned and found it to be P052E. This code is in reference to the Positive Crankcase Ventilation valve, which is responsible for routing excessive crankcase gases. After extensive research online, it would seem this is a known issue for Mercedes once they reach 50,000 miles, right outside of warranty. This is a very costly fix due to it being labor intensive. This should be a recall as it is a known mechanical issue, and even the dealers echo the same.

- Carmel, IN, USA

I made 2 engine stalling complaints at the dealership in 2021/2022.. the dealership kept my vehicle for 2 days and said nothing was wrong. My vehicle recently in stalled in drive gear, I had to cut the car off & turn it back

- Houston, TX, USA

PO52E code showed was the code pulled on my 2016 Mercedes c 300 4 matic. My car had 73000 miles on when I bought it and that code was pulled when I bought it. At 73000 miles my car shouldn-??t have this problem.

- Holland , OH, USA

A fuel smell can be detected at idle inside the vehicle and around the engine area. A recall for some VIN's of this model in this year was enacted but not this particular model. No visible fuel moisture can be detected. A repair facility stated it might be a faulty clamp on the return fuel line. The recall was for dirt on manufacturing between the fuel injectors/fuel rail. This is a safety / emissions problem that hopefully does not lead into a fire. No warning lights are present. This started about 2 months ago

- Golden, CO, USA

Gas smell inside the cabin. Check engine light on. Took to dealer, stated P052e code came up. Positive crankcase ventilation valve went bad. The dealer says it is a pretty common problem for this vehicle and engine. Quote came back close to $2900 for parts and labor

- Houston, TX, USA

My check engine light came on at about 68,800 miles. The OBD code shows that I need the Positive Crankcase Ventilation valve replaced. The repair for this is approximately $2,300 and requires about six hours of shop labor, and the part costing over $425. I-??ve never known a PCV replacement on any vehicle to be more than $60, with the part itself being about $10-$20. Most times, the part can be simply cleaned and replaced. This is very disappointing. Especially given that the engine design, just two years prior, would have been less than $200 for the same repair, with part costing about $60. The vehicle does not show any symptoms of the part being blocked, as indicated in the code. There is no hesitation, loss a power or decline in fuel efficiency. However, the engine light cannot be turned off until the part is replaced. I think that $2300 to replace a part on seven year old car, well under 100,000 miles is indicative of either poor design or predatory. Hopefully, something can been done to address this. Thank you!

- New Alexandria , PA, USA

Crankcase Ventilation Valve malfunction at under 50k. Check engine light is on and I took it into the shop after gas fumes were coming into the car through the ventilation system. I was informed that has been an ongoing issue with Mercedes and I was referred to fill out this document to try and kickstart a recall process. This is a problem that is very costly, and seemingly is happening to most recent models at around the 50k mark. Beyond that is is also a safety hazard as it is causing gas fumes to enter the cabin of the vehicle.

- Chicago, IL, USA

code P052E on 71000 miles. The crankcase vent valve replacement.

- Raleigh, NC, USA

My vehicle (2016 C-class 300) has a strong gas smell when the vehicle is cold and idling. Seems like it's common problem in W205 C300 cars. Taking to the dealership for diagnostics there is a class action investigation: Https://www.sauderschelkopf.com/investigations/automoti ve/Mercedes-C300-and-gla250- fuel -smell-class-actioninvestigation/ you can see multiple people complaining about the same fuel lines;

- Cincinnati, OH, USA

The contact owns a 2016 Mercedes-Benz C300. The contact stated he noticed an abnormal fume odor entering through the air vents of the vehicle. The contact self-diagnosed the vehicle as having a fuel leak from the fuel pump. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 83,000.

- Washington, DC, USA

CEL on, P052e code for crankcase ventilation/PCV failure. Vehicle has about 55k miles. Extremely common failure on these vehicles at this mileage and expensive/complicated to repair. Will not pass state emissions because of this. Given extensive anecdotal evidence of the pervasiveness of this problem, recall should be issue.

- Gaithersburg, MD, USA