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Vacuum check valve to connecting pipe.

Air pump to air filter housing

Air pump to midpipe

Breather hose on back of manifold.

A bad PCV breather hose can not only make a mess in your engine bay spraying oil everywhere, it can have a negative impact on your engine's performance and fuel economy. A genuine Audi part, this will be a direct replacement on 1.8T motors.

A bad PCV breather hose can not only make a mess in your engine bay spraying oil everywhere, it can have a negative impact on your engine's performance and fuel economy. This updated design has a reinforced gusset to last longer than the original stock...

A bad PCV breather hose can not only make a mess in your engine bay spraying oil everywhere, it can have a negative impact on your engine's performance and fuel economy. A genuine Audi part, this will be a direct replacement on 1.8T motors. ...

Check valves are used through the car's vacuum system to operate things like wastegates, brake boosters, and even boost gauges. If you're having any problems with your vacuum system these valves could be the culprit. This particular valve helps regulate...