Check both air paths
Inspect hoses and pipes between components for leaks. Include the vacuum and PCV system, not only the large charge-air hoses. Inspect the diverter valve and N75 boost-control valve according to their application-specific tests.
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Consider throttle condition
A dirty throttle body is another listed cause. If cleaning is justified, use the correct cleaning and throttle-alignment procedure for the engine; the code page alone is not a disassembly instruction.
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A useful BPY branch
For the North American BPY 2.0T, Ross-Tech references breather-valve bulletin 2018919. Abnormally strong crankcase vacuum at idle can accompany breather failure. Confirm the bulletin application before replacing anything.
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Sources / references 1
- Ross-Tech fault reference ↗Reviewed Oct 8, 2026
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