Question about 1999 Audi A4
That noise is the secondary air pump (an emissions device) and it appears to be failing. If you have emissions checks in your state inspection, when it fails completely you'll end up with two codes and a check engine light and will not pass inspection. I assume you hear this only on cold start, correct? If so, then it's your secondary air pump.
Posted on Jul 02, 2011
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
Tips for a great answer:
Oct 23, 2015 | 2002 Mercury Mountaineer
Sep 29, 2015 | Suzuki Cars & Trucks
Apr 19, 2015 | 2000 Lincoln Town Car
Jul 02, 2013 | Cars & Trucks
Mar 04, 2011 | 1990 Chevrolet Lumina
Aug 14, 2010 | 1999 Jeep Grand Cherokee
Jun 04, 2009 | 2002 Lincoln Town Car
Nov 29, 2008 | 1997 Dodge Ram 2500 Club Cab
Sep 28, 2008 | 2000 Volkswagen Passat 4Motion
Jun 30, 2008 | 2001 Chevrolet Malibu
159 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: