I HAVE 2 MECEDES WITH THE SAME ISSUE PER MERCEDES BENZ OF USA INSPECTION CAUSING ENGINE LIGHT TO BE TRIGGERED PER DIAGNOSIS TESTING RAN ON BOTH CARS. 2015 VIN [XXXXX] GLA 250 4 MATIC-P052E71 2016 VIN [XXXXX0 2013 CLA 250 MATIC -P052E71 I WAS TOLD BY A MERCEDES SERVICES ADVISIOR THAT BOTH CARS HAVE THE SAME ENGINE FOR A 2015GLA AND A 2016 CLA - BOTH Due to both cars stalling in traffic on multiple time when driving I took both to the shop to run further testing to discover both had the same engine light trigger which is the CRANKSHAFT (AKA) OIL SEPERATOR (AKA)INTAKE TUBE DUE TO THIS BOTH CARS HAVE SUFFERED AN ISSUE WHEN TAKING EMMISSION TEST - MERCEDES DIGNOSIS TESTING CODES -P052E71 - CRANKSHAFT VENILATION MALFUNCTION - CAR WILL NOT PASS EMMISSION TEST AND THIS PART DEFECTS ALSO CAUSES CAR TO STALL THAT CAN POSSIBLE CAUSE ACCIDENT THIS PART COMPLETE REPAIR COULD COST UP TO $2500-$3000 FOR PARTS AND LABOR PART NUMBER -270-090-07-00 (CRANKSHAFT) THE ENGINE LIGHT ISSUE TRIGGERED BY CRANKSHAFT AND WILL NOT PASS EMMISSION TESTING DUE TO THIS Description of this part below: Crankcase Ventilation is the process of venting or removing blow-by from an engine's crankcase to prevent excessive pressure build-up within the engine. Blow-by gases are mixed with oil mist and other contaminants that can harm an engine's internal components and contaminate the environment. How does the crankshaft ventilation work- When the vehicle is moving, airflow across the open end of the tube creates suction (a "draught" or draft) that pulls gases out of the crankcase. To prevent too much vacuum being created, the blow-by gases are replaced by fresh air using a device called a breather. The breather is often located in the oil cap the engine misfires, you may have trouble getting your vehicle up to speed. Misfires often happen when your vehicle is under load while accelerating. This can result in slow or sluggish acceleration or a jerking motion while pressing down on acc

- Atlanta , GA, USA

Code: 052E71 - Valve for crankcase ventilation has a malfunction or block. This car has 48, 182 miles and is requiring $2000 worth of repairs.

- Chapin, SC, USA

Automatic start /stop failed on highway car would not move, almost caused an accident. This has been repaired twice and now it has happened again. CLIENT STATES VEHICLE CUTS OFF AT IDLE Cause:. Correction: 540650 ON-BOARD POWER SUPPLY VOLTAGE MAINTAIN (WHEN CHECKING/ TESTING AND TROUBLESHOOTING) Tech Number: 20 Labor Type: WNC8 541011 PERFORM QUICK TEST Tech Number: 20 Labor Type: WNC8 275002 REPLACE ELECTROHYDRAULIC CONTROLLER UNIT OF DUAL-CLUTCHTRANSMISSION Tech Number: 20 Labor Type: WNC8 272388 REPLACE CONTROL UNIT OF DUAL- CLUTCH TRANSMISSION (ELECTROHYDRAULIC CONTROLLER UNIT REMOVED) ON VEH. WITH Tech Number: 20 Labor Type: WNC8 540991 PROGRAM AND CODE CONTROL UNIT.................... (AFTER QUICK TEST) Tech Number: 20 Labor Type: WNC8 271254 CHECK/CORRECT OIL LEVEL OF DUAL-CLUTCH TRANSMISSION (AFTER LEAK TEST) Tech Number: 20 Labor Type: WNC8 271048 ADAPTATION PERFORM (AFTER REPAIRS)

- Trenton, NJ, USA

While merging onto the freeway on 1/22/2021 the car's dashboard displayed "collision prevention assist plus inoperative " and the check engine light come on. When this happened, it prevented me from accelerating the car by pushing onto the gas pedal. This caused the car from behind to almost rear ended by car. I was able to drive onto the shoulder of the freeway and exit the freeway. I have taken this car to the Mercedes dealership for repair but it is an ongoing issue even after various parts have been replaced.

- Keller, TX, USA

My 2016 Mercedes-Benz C300 after undergoing the recommended maintenance via the Mercedes-Benz dealer, while driving down the public road lost power, the lost of power with no warning to me or any other drivers around me, the vehicle went from 45 mph to 10 mph this was due to a decentigrating piston, the vehicle manufacture advertised that the vehicle would cut power to protect the engine from causing it self further damage, this seemed like a great safety feature until it just happen, I had no control over the vehicle, it just seemed to take on a life of its own, the vehicles behind or adjacent to me had no warning that the vehicle would decrease the speed, so I had to muscle the care out of the swirling traffic, I was devistated that my car caused me such fear and dealing with the fact that the car could have killed me or some one else near me, I had the vehicle towed to the local dealer who had serviced the vehicle since it was new and the dealer explained that the piston in the internal combustion engine had decentagrated thus causing metal shavings to be distributed throughout the rest of the engine, and I would be charged for the total cost of the repair of the engine. It appeared that this should have been disclosed to the owner of the vehicle or placed in the owners manual, but the only response from Mercedes was we change out these engines all the time they always blow engines, you can call Mercedes-Benz advocacy to discus the warranty from which I never receive a response. If the manufacture places know bad parts in to a vehicle and sales it to the public, then that manufacture should have to pay for the repairs of the customers vehicles either individually or thru a recall process.

- Harvest, AL, USA

Automatic engaging of emergency break while driving or stationary together with signals of collision prevention assistant plus inoperative and two other errors (in pictures). Car was bought recently bought and delivered to me on January 1st, 2020. It has been taken back to dealer twice for same errors. It was replaced the battery twice as dealer indicated it had to do with auxiliary battery malfunctioning which was also another error showing in the panel.

- Miami, FL, USA

I purchased the vehicle January 2019, the vehicle was running smooth for a couple months. Now it is January 2020 and between the months of September and now I have been to Mercedes about 4 times. The car doesn't reverse sometimes while I am driving. The words 'car cannot reverse' comes up on the dashboard. I couldn't use the heat in November due to a gas smell coming in the car. Sometimes I will be in gear 3 and the car will change to gear 5 on its own. As of right now there is a burning smell surrounding the vehicle when you are done driving it.

- Brooklyn, NY, USA

The contact owns a 2016 Mercedes-Benz Cla250. While stopped at a traffic light, the vehicle stalled, the gear shifter failed to shift into neutral, and the brake and accelerator pedals traveled to the floorboard when depressed. There were no warning indicators illuminated. The police assisted with moving the vehicle off the highway. The vehicle was towed to Mercedes-Benz of los angeles (801 S figueroa St, los angeles, ca 90015, (213) 425-3100) where it was stated that a new starter was needed; however, the vehicle was not officially diagnosed or repaired. The manufacturer was not contacted. The failure mileage was 21,100.

- Montebello, CA, USA

My car has shut off on me while driving two times and road side assistance came out two different occasion. I kept up with maintenace on the vehicle. I went to pep boys up the St from my house instead of Mercedes for oil changes. Out of no where my engine light came on and I towed my car two Mercedes to fix. They said my engine blew N the turbo. They won't cover it under warranty since I gave them all my maintence receipts from pep boys. This was a demo car I originally leased and had it for 2 years with 9 months left on the car. The recalls on the VIN were not fixed and Mercedes is trying to send me away with a unfixed car. Please help

- Medford, NJ, USA

Water pump cracks in very cold weather over heats while in drive and floods into engine

- Chicago, IL, USA

If something in the roadway hits the oil pan it will crack and causing the engine to lock up without notice. It seems there should be something protecting the oil pan preventing this from happening and more time notifying of low oil should be allowed to move off the road way and shut the engine down. I also question the strength of the material or design of the oil pan.

- Metairie, LA, USA