Is it better to replace just the diaphragm or the whole valve/cover?
Hi 👋 From my experience, it’s usually better to replace the whole valve/cover rather than just the diaphragm. The membrane might fix the issue temporarily, but the housing and other internal parts also wear out over time. I went with a complete unit from KLIFEX https://klifex.net/products/crankcase-ventilation-valve-for-vag-2-5l-passat-usa-jetta-usa-07k103469l — fitment was perfect, and it solved the rough idle and vacuum issues for good 👍