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P0491 Diagnostic Trouble Code Discussion for October 2009

Secondary AIR System Insufficient Flow Detected (Bank 1)

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Trouble Ticket Help Requests for DTC P0491
Help Request Posted
2004 BMW 325xi 2.5L MIL Lamp on VIN: WBAEU33464
P0491: Bank 1 cat. ... On 8/27/08 we replaced the secondary air pump (was dead) and then we had peace until 3/2/09 when codes P0491, P0492 came back. At that point we replace the exhaust shut off valve and smoke tested the exhaust port to the ...
October 14, 2009