Installed in the Audi A4 B7 from 2005. After replacing the PCV valve, the check engine light went out and everything was fine. Unfortunately, it only took about 2 weeks to fix, which made me wonder if this was the original problem. And the car made a loud whistle. I ordered a new (OEM) one from ECSTuning along with a new gasket. After a few days the check engine light went out and the whistling stopped. I suggest you spend the extra $$ to get a higher quality or OEM unit.
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