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P1421 Diagnostic Trouble Code Discussion for January 2010

Cold Start Emission Reduction Strategy Monitoring

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Trouble Ticket Help Requests for DTC P1421
Help Request Posted
1997 BMW 528i 2.8L MIL Lamp on VIN: WBADD5322V
P1421: secondary air. This is odd, i have two flow codes, I know for certain the air pump, check valve, solenoid , vacuum hoses, fuses, relay are all good. The pump runs when asked to, and blows lots of air, the passages in the air tube seem clear, when the check valve is disconnec...
January 08, 2010