A4 Quattro Wagon L4-2.0L Turbo (BPG) (2005)
The guide pin of the check valve in the intake manifold side of the valve (Figure 2) may break, preventing the check valve from correctly sealing when
boost pressure is present in the intake manifold. Intake boost pressure will thus be applied to the engine crankcase, resulting in oil leaks and preventing
engine oil from properly draining from the turbocharger through the oil return line.
Production Solution
Improved crankcase ventilation system pressure regulating valve.
Service
1.
Inspect the crankcase ventilation system pressure regulating valve.
2.
If the check valve is stuck open or its guide pin is broken, replace the crankcase ventilation system pressure regulating valve.
Warranty
Required Parts and Tools