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Here is the diy video of how to replace crank case ventilation valve on m54 engine, similar to bmw e46, 2003-2005 bmw z4 e85, 2000-2006 bmw x5 3.0i e53, 2004-2005 bmw x3 e83, 2000-2003 bmw 530i, 525i e39
Failure of this item usually leads to oil leaks and air leaks which makes car running lean, with codes p0171 and p0174