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P0491 Diagnostic Trouble Code Discussion for March 2009

Secondary AIR System Insufficient Flow Detected (Bank 1)

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Trouble Ticket Help Requests for DTC P0491
Help Request Posted
2002 BMW 540i 4.4L MIL Lamp on VIN: WBADN63442
P0491: Secondary Air Injection System Insufficient Flow bank 1. Hi and thanks for your help. Customer just bought this 540i last fall and it's spent most of it's time parked this winter (lotsa snow...). Every time it shows up it has these secondary air injection codes stored. I've been reading some posts and it seems the h...
March 19, 2009