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A6 / S6 (C5 Platform) Discussion Discussion forum for the C5 Audi A6 and S6 produced from 1998-2004

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Old 07-18-2011, 01:44 PM   #1
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Default P0491 and P0492 first and second bank secondary air injection code

I have a 2003 Audi A6 Quatro 3.0L 130,000 that just threw these codes. Any hints on where to start looking as to why?
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Old 07-18-2011, 05:45 PM   #2
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Any recent damage or work done to the front end right side(passenger side)???
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Old 07-23-2011, 01:20 AM   #3
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Vacuum lines going to Combination valves or the valves themselves, secondary air pump and/or hoses, power to the pump are some of the things to start with.
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Old 07-23-2011, 01:20 AM
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04, 2003, a6, air, allroad, audi, bank, code, engine, fix, injection, p0491, p0492, secondary, system

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