Hello, I have 2016 Mercedes Benz c300(W205). Recently I got a Check Engine Light with P052E71. And the solution is to replace the Crankcase Ventilation Valve/Oil Separator, Intake Manifold. These parts are positioned on the right side bottom of the engine. It was a labor intensive work which required to remove multiple parts to gain access to the oil Separator. Considering the Issue Persists from W205 and Mercedes Benz has not done anything to rectify it, the cost is actually burdened upon the customer.

- Plano, TX, USA

P052E emissions code

- Stony Point , NY, USA

While driving the check engine light came on. The inside of the car started to smell like gas. A diagnostic check was performed at the Mercedes dealership and it was determined that there were 2 faults: low boost signal & ME control unit this was due to oil leaking from the crankcase vent line through the engine wiring harness and into the ME (engine module).

- Maumelle, AR, USA

The contact owns a 2016 Mercedes-Benz C300. The contact stated that after turning off the vehicle and locking the doors; after a while, the vehicle would independently unlock the doors and then start up without driver input. The vehicle was taken to the dealer however, the mechanic was unable to determine the cause of the failure. The vehicle was not repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 43,000.

- San Diego, CA, USA

Failure in the performance of the Crankcase Ventilation Regulator valve, research online indicates this is a very common issue especially in w205s. Mercedes has omitted this from their gasoline powered, emissions control warranty, but is listed under the BLUtech/ Diesel warranty. The car will fail the emissions test, and Mercedes Models have a recurring problem with this part which is charged out of pocket once vehicle warranty is up.

- North Andover, MA, USA

Check engine light and error code P052E - Positive Crankcase Ventilation regulator Valve Performance. Within a year of having the same error code repaired using warranty, I'm again getting the same error code. This is a very expensive repair costing upwards of $2000 as per dealer and I'm having to do this repair again. This should be some kind of manufacturing defect and needs to be recalled.

- Bolingbrook, IL, USA

- CRANK CASE VENT VALVE malfunctioned, it was available for inspection upon request with fee - It made oil burning smell - The problem has been confirmed by a dealer and replaced with an expensive fee - Engine check light was

- Dix Hills, NY, USA

The vehicle lost power on the Freeway, coasted the off-ramp, and came to a stop, the dealership after describing the issue said that it sounded like a bad piston. Said they have had a couple come in with the same problem. Their diagnosis was a bad piston a day later. The mileage is less than 50,000 miles and the car was driven daily to work 4 miles each way. There were no warnings or symptoms of failure prior to happening. The warranty on the vehicle has expired on 7/1/2021

- Norwalk, CA, USA

Around the 58,000 mile mark my check engine light on my 2016 Mercedes C300 4MATIC came on. I checked the gas cap, as that can set off the check engine light, and the check engine light went off the next day. 3 days later the check engine light comes on again, so I repeated the steps of taking the gas cap off and putting back on. The light did not go off the next day. 5 days later the light goes off again. This happened several times over a span of 2-3 weeks. I then take my car to be checked with an OBD-II Scanner. It read off every time the check engine light had been on, which was several times. The error code the scanner displayed was "P052E" and a description of "Positive Crankcase Ventilation Regulator Valve Performance". It was the same code multiple times. At this point I did a little research to see if this was something I could repair. While researching the issue, I found that case after case of the very same issue was being reported by owners of cars like mine. I then came across a post that said they had reported the issue to NHTSA and was told that it was such a widespread issue that if "A few more cars are reported to have this issue then a recall would potentially be issued because of the amount of cars that are having the exact same issue at very similar mileages, and it is a very expensive repair. I just feel that this is too common of a problem by the same cars, at the same mileages from the same Manufacturer.

- Sevierville, TN, USA

P052e positive crankcase ventilation

- Binghamton , NY, USA

2016 MB 300 C, AWD at 87000 miles started giving gas fuel smell when parked in our garage after driving. I took to a local Foreign Car Repair facility and they found a fuel leak at the fuel injector pump. The mechanic changed the Fuel Injector Pump (Bosch) at a total cost of $745.31. Since the change in the pump, the smell has stopped and I feel safe. Who is responsible to reimburse this cost to me?

- Flemington, NJ, USA

My 2016 C300 4matic, which has been serviced exceptionally well, turned 57,000 miles (7K miles outside of warranty), had the check engine light turn on. I went to my mechanic, who has a state of the art diagnostic unit, and it was diagnosed as code P052E which means that the crankcase ventilation regulator valve including the fuel rail needs to be replaced. Mercedes has known about this being a major problem as they modified one of the parts. My dealership quoted me over $ $2100 to fix it and deemed it not covered by the extended warranty. I have gone online to several Mercedes Benz forums and hundreds of people have had the same thing happen with this part failing around 52K mark. Since Mercedes knew about this - issued an improved part to replace the defective one - NHTSA should mandate a recall. This is not some simple dyi matter. It is a complicated repair consuming many hours. It is wrong that driving this, with this code, could literally kill you. I implore NHTSA to mandate a recall based on the facts specified herein. By the way I have a 1999 ML320 that I have meticulously maintained and drives perfect and I have owned many other Mercedes Benz. I am 58 years old and I have never filed a complaint with NHTSA before. This is a very serious matter. Please help

- Hagerstown, MD, USA

2016 C300 4matic at about 50K miles, check engine light came on and then as I was driving on the freeway the car just stopped accelerating in the middle of the freeway and had to take my car to the side and towed it to the dealer in West covina. Luckily there was no one on the freeway since it was early Sunday morning. Dealer is now saying the car might need engine replacement which will cost me $20K but they want $3000 to do a tear down to make sure. Opened a case with their customer service but they said they can't do anything about it since the car is out of warranty. I am incredibly upset with Mercedes Benz - I have not used the car that much and maintained it myself according to their maintenance booklets. I believe this is an engine defect problem that Mercedes needs to take care of.

- Chino Hills, CA, USA

Fuel smell in cabin - fuel leak in engine compartment. From dealer invoice: Found fuel line leaking from rubber line that comes from bell housing fuel line connector to high pressure fuel pump on engine head.. R and R battery ground.. R and R belly panels.. depressurize fuel system.. replaced rubber fuel line that comes from bell housing fuel line connector to high pressure fuel pump on engine head.. cleaned away contrast spray and test drove again, , problem is resolved.

- Alpharetta, GA, USA

The contact owns a 2016 Mercedes-Benz C300. The contact stated that the vehicle produced an abnormal mold odor, which distracted the contact while driving. The vehicle was taken to Mercedes-Benz of mckinney (2080 N central expy, mckinney, tx 75069, (844) 302-4009) where it was diagnosed that an air conditioning flush was needed. The vehicle was repaired, but the odor returned the following day. The manufacturer was not made aware of the failure. The failure mileage was 16,000. The VIN was unknown.

- Frisco, TX, USA

The contact owns a 2016 Mercedes-Benz C300. While traveling various speeds, the engine siezed and the vehicle entered into limp home mode. The contact stated that all the warning indicators illuminated. The vehicle was taken to Mercedes-Benz of tysons corner (8545 leesburg pike, vienna, va 22182), but they were unable to replicate the failure. The manufacturer was notified of the failure. The failure mileage was approximately 29,000.

- Ashburn, VA, USA

The contact owns a 2016 Mercedes-Benz C300. While driving approximately 71 mph, a knocking sound was present coming from the engine. The vehicle began to thrust back and forth as if it were running out of fuel. Also, a burning odor was present before the speed suddenly reduced to approximately 20 mph. The speed would not increase when the accelerator pedal was depressed. The vehicle was towed to the local dealer (smith motors in haverhill, MA) where it was diagnosed that the engine was faulty. The cause of the failure was not determined. After three months at the dealer, the motor was replaced to remedy the failure. While depressing the brake pedal, a screeching noise was present. The vehicle was taken back to the dealer where it was determined that the brake pads needed to be replaced. The failure mileage was approximately 354.

- Methuen, MA, USA

The contact owns a 2016 Mercedes-Benz C300. The contact received notification of NHTSA campaign number: 17V114000 (electrical system, engine and engine cooling). The parts to do the repair were unavailable. The contact stated that the manufacturer exceeded a reasonable amount of time for the recall repair. The dealer (atlanta classic cars Mercedes-Benz located at 1705 boggs rd nw, duluth, ga 30096; (770) 279-3600) was called and the contact left a voice message. The manufacturer was not contacted. The contact had not experienced a failure. VIN tool confirms parts not available.

- Stone Mountain, GA, USA

The contact owns a 2016 Mercedes-Benz C300. When the contact attempted to drive the vehicle, the push start button failed to start the vehicle. The vehicle was taken to the dealer (West palm beach Mercedes-Benz located on 4000 okeechobee, West palm beach, fl). The contact was informed that the correct key was not used to start the vehicle. The vehicle could not be serviced because the part for the repair was unavailable. The vehicle was not repaired. The contact received notification of NHTSA campaign number: 17V114000 (electrical system, engine and engine cooling). The part needed for the repair was not available. The contact stated that the manufacturer exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The approximate failure mileage was 11,000. VIN tool confirms parts not available.

- Lake Worth, FL, USA

The contact owns a 2016 Mercedes-Benz C300. The contact received notification of NHTSA campaign number: 17V114000 (electrical system, engine and engine cooling). The part to do the recall repair was unavailable. The contact stated that the manufacturer exceeded a reasonable amount of time for the recall repair. The local dealer, Mercedes Benz of fort Washington 404 Pennsylvania avenue fort Washington, pa 19034, was contacted and informed the contact that they had not heard of the recall previously. The manufacturer was not made aware of the issue due to a constant hold time applied to the calls. The contact had not experienced a failure. VIN tool confirms parts not available. The consumer stated the he wanted to withdraw his complaint. Updated 09/20/2017

- Rose Valley, PA, USA