P1421 Diagnostic Trouble Code Discussion for December 2007
Cold Start Emission Reduction Strategy Monitoring
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| 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 |
