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P0491 Diagnostic Trouble Code Discussion for August 2008

Secondary AIR System Insufficient Flow Detected (Bank 1)

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Trouble Ticket Help Requests for DTC P0491
Help Request Posted
2006 Audi A6 Quattro 4.2L MIL Lamp on VIN: WAUDL74F96
P0491: Secodary air issue. Bank1. We don't have VIN specific scan tool for an 06. Past experience has show the check valves& vac.lines as major issues when only one bank envolved. Any help would be appreciated. V.
August 27, 2008
2003 BMW X5 4.4i 4.4L MIL Lamp on VIN: 5UXFB33543
P0491: secondary air injection low flow bank 1. ... street, sets code p0491 every third or fourth cold start. I deal with secondary air problems on VW/Audi vehicles on a regular basis, and have only once come up with no problem but still setting the code. This X5 is the first BMW(although we do service a lo...
August 28, 2008