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P0491 Diagnostic Trouble Code Discussion for October 2012

Secondary AIR System Insufficient Flow Detected (Bank 1)

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Trouble Ticket Help Requests for DTC P0491
Help Request Posted
2002 Audi A6 Quattro 2.7L MIL Lamp on VIN: WAULD64B52
P0491: secondary air injection system insufficient flow B1. ... the only thing I found leak was the hose splitting from the secondary air injection going to the right combi-valve had a crack and both combi-valve leak. These three thing I will be replacing, but would you guys suggest any other things that would cause th...
October 09, 2012