I have a Audi 2001 A4 Quattro and My check engine light came on and I have a code reader and two codes came up P491 and P492 which stands for secondary air system bank one and secondary air system bank two. How do I fix these problems? How much is it going to cost me? And is it necessary to fix immediately? Thank you for your help
have the same problem?
Friday, January 7th, 2011 AT 2:04 PM