2007 B7 A4 2.0t Cold Start Knock

Alex Ross
Alex Ross
939
0
Publicado 2018-10-05
Just replaced the PCV for code P0171. It has almost always done this on cold start (never this bad) The noise went away after the car had warmed up, and it ran fine.

Code "P0171 System too Lean" originally pushed me to replace the PCV, but after replacing it the code remained and code "P0507 Idle Air Control System RPM Higher Than Expected"
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