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P0491 Diagnostic Trouble Code Discussion for December 2019

Secondary AIR System Insufficient Flow Detected (Bank 1)

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Trouble Ticket Help Requests for DTC P0491
Help Request Posted
2007 BMW 328i 3.0L MIL Lamp on VIN: WBAWV13547
P0491: Secondary air bank 1 insufficient flow. I have an insufficient air injection flow for Bank 1. I confirmed the ports are plugged on cylinders 1 and 2. Cylinder 3 is clear however having only 1 cylinder clear on bank 1 does not keep the light off. My question is: How do I clean these air injecti...
December 05, 2019