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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
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