Replacing the PCV/breather valve on the EA888 is a quick top-of-engine DIY that cures a cluster of symptoms (whistle, rough idle, lean code).
Steps:
- The PCV is on top of the valve cover (or integrated into it on some engines).
- Unclip the breather hoses and unscrew the PCV valve (a few Torx) — mind the gasket/diaphragm.
- Fit the updated PCV with a new gasket/seal, reconnect the hoses.
- Where the PCV is integral to the valve cover, you replace the whole cover.
- Clear codes; confirm the whistle and rough idle are gone (a smoke test verifies).
Gotchas: use the revised part; make sure the hoses seat fully — a loose one is a fresh vacuum leak.
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