Fuel is leaking inside cabin whenever I turn on my heat

- Little Rock, AR, USA

I have noticed a recurring issue during the colder months where there is a strong gas smell inside the cabin, and I have also observed fuel dripping into the engine compartment. This issue seems to occur primarily in winter conditions. I was surprised to find that there has been no official recall or service bulletin addressing this concern, especially given the potential safety implications.

- Atlanta, GA, USA

PCV fault

- Beaverton, OR, USA

Check Engine light...P052E positive crankcase ventilation regulatory valve

- Mission Viejo, CA, USA

my car broke down while driving on the freeway, with only 58,000 miles the piston broke in cylinder 1 causing my car to loose power can cause an accident due to breaking down on freeway problem has been confirmed by a certified mechanic shop check engine light started flashing the moment the engine failed

- Tustin , CA, USA

error code P052E positive crankcase ventilation regulator valve performance

- Bastrop, TX, USA

This vehicle was 2nd owner via Mercedes CPO. Note I bought this 2016 in 2018 on CPO, so recalls and technical notes were confirmed to be resolved. Had last taken to Mercedes dealership. Vehicle was always running fine until about 64,000+ miles when a check engine light came on while just entering the freeway and the vehicle started shaking violently. Continue to drive the vehicle for a few miles to get to the destination. Had the vehicle towed to the dealership and the dealership declared that cylinder 1 had lost 80% compression and had a cylinder 1 piston crack. This is consistent with numerous claims on Mercedes message boards. Mercedes dealership said that this vehicle was not drivable and was not covered under warranty. Requested $11,000 for single piston repair or $15,000 for full engine rebuild replacement. Please note that M274 engine has this complaint. The engine is apparently a Nissan collaboration designed i-4 turbocharged engine and car is assembled in Alabama. Internal Mercedes technical bulletins talk about piston wrist pins. So Mercedes know there is an issue and they know status on my vehicle. Mercedes dealers have sent me documents on piston wrist pins replacement status. The recommendation is to rebuild or buy new motor. So i have no confidence that an engine rebuild will fix the issue. All oil change maintenance records show proper oil at proper intervals and multi-point inspections. Correct use of premium gas was used. Vehicle had been inspected and given all green remarks on multipoint review before the incident. - Got It ? Requesting investigation as I have 3 vehicles, Toyota (2002), Honda(2008), and YES a Mercedes(2005) with 216K miles. So don't tell me that this is my fault.

- Tracy, CA, USA

Code P052E71 Saying the Crankcase is bad. Seems to be an issue with MB.

- Edmonds, WA, USA

check engine light p052e positive crankcase ventilation regulator value performance

- Westminster, MD, USA

P0952 sensor part not available untill Dec 2024 I have documentation from my mechanic

- Kennesaw, GA, USA

A couple years back I had an engine light pop up and it was the code P052E which as I-??ve done my research and read a lot of forums this is a common problem with the W205 Mercedes Motors. As of today 04/18/24 the engine light came on and I got it diagnosed to find out it is the same problem again. This repair is almost $2000 and it is due to Mercedes faulty manufacturing of the PCV valve. I have read things that say there has been extended warranty on it and a lot of submissions for recalls, that I-??m not exactly sure of.

- Burnsville, MN, USA

Pcv valve has gone bad, and it seems like everyone i ask that is mercedes technician they all say these parts are terribly made and always break.

- Ontario, CA, USA

The Positive Crankcase Ventilation (PCV) valve is crucial for regulating the flow of gases in the engine's crankcase. If the PCV valve malfunctions or becomes clogged in a car like the 2016 Mercedes Benz C300 4-matic, several problems can arise: 1. **Increased Pressure:** A malfunctioning PCV valve can cause pressure to build up in the crankcase. This increased pressure can lead to oil leaks, gasket failures, or even engine seals blowing out. 2. **Poor Engine Performance:** When the PCV valve fails, it can disrupt the air-fuel mixture in the engine, leading to rough idling, stalling, or decreased fuel efficiency. This can result in a loss of power and overall poor engine performance. 3. **Contamination:** A faulty PCV valve may not properly route harmful gases, like unburned fuel and moisture, out of the crankcase. This can lead to contamination of the engine oil, reducing its effectiveness in lubricating engine components and potentially causing premature wear and damage. 4. **Increased Emissions:** A malfunctioning PCV valve can result in increased emissions from the vehicle, as it may not properly recirculate harmful gases back into the combustion chamber for burning. Overall, a nonfunctional PCV valve can negatively impact both the car's performance and the environment, potentially leading to costly repairs and increased pollution. Additionally, prolonged exposure to increased emissions from the vehicle can be harmful to both the environment and the health of individuals. Therefore, it's essential to regularly inspect and maintain the PCV valve to ensure proper functioning of the vehicle.

- Frankly Park , IL, USA

My Mercedes has a P052E check engine light code for its PCV value performance. I do see that many other drivers are having this issue and that repairs are around $2,000.

- Glendale, AZ, USA

Check engine light P052E crankcase vent valve thousands of same model have this problem should be recall

- North Bellmore, NY, USA

I recently received a CEL code P052e positive crankcase ventilation valve. Common problem seen in multiple forums.

- Castro Valley, CA, USA

M274 check engine light P052E71 Crankcase ventilation valve Topic: # LI 01.20-P-076794 crankcase ventilation cylinder head cover WIS-references document # AR01.20-P-9692MRU remove/install oil separator on crankcase.

- San Diego, CA, USA

Positive crankcase ventilation regulator valve performance

- Las Vegas, NV, USA

Crankcase Ventilation Valve Emission Modification -Error P052E71 -Error P06DA00

- Hayward , CA, USA

Error code PO52e crankcase ventilation

- Reedville, VA, USA