Oil separator / PCV valve failures
Often reportedFailures in the crankcase ventilation system (oil separator/PCV valve/return hoses) can increase oil consumption and cause smoke at idle or when lifting off the throttle.
Engine Bay
The most commonly reported issue when buying a used 2015 Audi A4 2.0 TFSI (B8 facelift): Oil separator / PCV valve failures. Carbon buildup on intake valves is also frequently reported.
Engine varies by trim; verify the engine code on the listing.
Listed from most frequently reported, each with its source.
Failures in the crankcase ventilation system (oil separator/PCV valve/return hoses) can increase oil consumption and cause smoke at idle or when lifting off the throttle.
Engine Bay
Direct injection engines like this TFSI can suffer from carbon buildup on intake valves, impairing combustion and causing rough idle.
Engine Internal
Wear or breakage of the timing chain or tensioners has been reported; this can cause abnormal noises during startup or when hot, and in severe cases may require replacement of the chain and related kits.
Timing chain
Same trim, different year
We only publish claims we can verify. Cards come from Difetti fault records matched to this vehicle on brand, fuel, engine and generation.