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P1421 Diagnostic Trouble Code Discussion for March 2008

Cold Start Emission Reduction Strategy Monitoring


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Trouble Ticket Help Requests for DTC P1421
Help Request Posted
2000 BMW 528i 2.8L MIL Lamp on VIN: WBADM6344Y
P1421: secondary air system low flow bank 1. air pump activated, good output. ck valve tested good. Vacum supply good from solenoid. what causes these codes to keep coming back even though every thing checks out? Any help appreciated.
March 26, 2008
2000 BMW 528i 2.8L MIL Lamp on VIN: WBADM6344Y
P1421: secondary air system low flow bank 1. air pump activated, good output. ck valve tested good. Vacum supply good from solenoid. what causes these codes to keep coming back even though every thing checks out? Any help appreciated.
March 26, 2008