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Audi 100, S4: 1992-1994, A6, S6: 1995-1997 (C4) Secondary Air Pump Issue


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Last Post: Jun 11, 2010 10:37 AM Last Post By: NH-USA
pgoyer

Posts: 1
Registered: 11/28/06
Secondary Air Pump Issue
Posted: May 17, 2010 7:38 PM
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1997 A6 with 125k
Check Engine code P1411 weak flow of secondary air in Bank 2
Checked all vacuum and no problems
Air flow thru Combi valve no.2 OK
Air flow thru exhaust manifold poor

Replaced Catalytic Converter
Problem solved for 3 weeks
Now it's back and the exact same symptoms, ie... poor flow thru bank 2 exhaust...
Is my engine killing my bank 2 cat?

Engine does not use oil, and I never over fill

I'm stumped....
NH-USA

Posts: 42
Registered: 01/31/06
Re: Secondary Air Pump Issue
Posted: Jun 11, 2010 10:37 AM   in response to: pgoyer in response to: pgoyer
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One of three problems

1. leaking vacuum lines.. easy fix
2. bad combi valves
3. bad air pump

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