Mercedes Crankcase Vent Valve Kit - Genuine Mercedes 2700900700

Mercedes’ latest attempt at an entry-level sedan and CUV with a gasoline engine resulted in a couple of fairly popular models between the CLA250 and GLA250. Underneath their respective hoods lies the M270, a 2.0L turbocharged inline-four that toes the line between economical and grin-inducing fun. However, their reliability is not a strong point, as many owners have found out. 

Mercedes-Benz M270 Crankcase Vent Valve

The Crankcase Vent Valve is a particularly common issue on the engine and not quick to repair, thanks to its routing around an engine mount. Within the crankcase vent valve assembly, there’s a handful of parts, like the costly air-oil separator and lowly hoses. Like other cars, there’s also a heating element inside to prevent freezing during short trips when condensation cant evaporate in cold weather. That heater is the common failure point, forcing the entire assembly to be replaced. 

Unfortunately, its become a large issue for CLA250 and GLA250 owners as what seems to be every model has been hit with this incredibly costly repair. According to techs and owner’s forums, failures typically occur around the 55-60,000-mile mark and are accompanied by a single engine code that means a certain replacement: P052E.

Mercedes-Benz M270 Crankcase Vent Valve Replacement

Taking your CLA250 or GLA250 to the dealership for a crankcase vent valve repair is costly. Shops will charge between 4-7 hours to complete the job plus the cost of a new valve, which can total over $3000. Thankfully, the replacement process is DIY’able, and you’ll only need Mercedes p/n 2700900700 to complete the job. That’s the complete assembly from Mercedes and is guaranteed to fix the issue, at least for a little while.