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P1421 Diagnostic Trouble Code Discussion for December 2007

Cold Start Emission Reduction Strategy Monitoring

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Trouble Ticket Help Requests for DTC P1421
Help Request Posted
1996 BMW 328i 2.8L MIL Lamp on VIN: WBACD4322T
P1421: Secondary air system. We have searched the forums and many posts point to a bad pump and valves. The funny part is my pump runs sometimes and I can jump the relay terminals and the pump will run fine. It appears the ECM is not energizing the relay. From what we could find the pump ...
December 11, 2007