Car Trouble Engine Light On

STR8STRESSIN

MEMBER
2001 AUDI A4
6 CYL
AWD
AUTOMATIC
90,600 MILES

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

Friday, January 7th, 2011 AT 2:04 PM

4 Replies

KKNIGHT

MEMBER
1 POST

I would like to ask the same question.

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Sunday, June 17th, 2012 AT 9:23 PM

EXOVCDS

MECHANIC
1,883 POSTS

Since it is affecting both banks. Look for a common problem.

- Secondary Pump Relay (not working)
- Secondary Air Pump Fuse (burnt/blown)
- Secondary Air pump (seized/broken)
- Vacuum Solenoid for Combi Valves (not working)
- Vacuum Leak in Combi Valve hoses.

Thomas

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Sunday, June 17th, 2012 AT 9:44 PM

EXOVCDS

MECHANIC
1,883 POSTS

Secondary Air Injection components:

#1 - air pump
#11 & #12 - combi valves
#26 - vacuum solenoid

Relay Location: (fuse is in the same area)

Thomas

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Sunday, June 17th, 2012 AT 9:55 PM

ASEMASTER6371

MECHANIC
52,796 POSTS

The lines clog up on occasion and the valves fail as well. The system needs to be checked to make sure the pump is working, lines are clear, solenoids are working and the passages to the head are clear.

Cannot estimate anything till we know the exact failure.

Roy

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Monday, June 18th, 2012 AT 1:26 AM