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Old 07-21-2007, 02:43 PM
1st Gear
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Default P0491 and P0492??

Got these codes saying Secondary Air System bak 1 and bank 2? What could this be? I had them reset and the CEL hasn't come back on yet....?
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Old 07-22-2007, 12:17 AM
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Default RE: P0491 and P0492??

Bentley Publishers doesn't list those codes. Lets hope they
don't return.
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Old 07-22-2007, 09:07 AM
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Join Date: Jun 2006
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Default RE: P0491 and P0492??

could be a combi valve or the vacuum lines to the valves. Do you hear the pump running after start up(sounds like a hair dryer). If the engine is already hot enough though you will not hear it run
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Old 07-22-2007, 12:11 PM
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Default RE: P0491 and P0492??

This is a picture of the secondary air injection pump. You might want to check the hoses for any leaks.

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01, 0491, 0492, 2000, 2001, 2004, 42, a4, a6, air, audi, code, injection, kombi, p0491, p0492, secondary, system, trouble

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