Mechanics

CAR TROUBLE ENGINE LIGHT ON

2001 Audi A4 • 6 cylinder 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
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Str8stressin
January 7, 2011.



I would like to ask the same question.

Tiny
Kknight
Jun 17, 2012.
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

Tiny
Exovcds
Jun 17, 2012.
Secondary Air Injection components: #1 - air pump
#11 & #12 - combi valves
#26 - vacuum solenoid

Relay Location: (fuse is in the same area)

Thomas

Tiny
Exovcds
Jun 17, 2012.
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

ASEMaster6371
Jun 18, 2012.