P1421

Tiny
FLEETSIDE59
  • MEMBER
  • BMW 528
2000 BMW 528I CODE 1421 KEEPS COMING UP
BY ENGINE RUNS FINE
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Wednesday, September 19th, 2007 AT 4:27 PM

1 Reply

Tiny
MERLIN2021
  • EXPERT
P1421 Secondary Air System Bank 1
This is what i come up with...


https://www.2carpros.com/forum/automotive_pictures/62217_1421_1.jpg


This is the troubleshooting flow chart for it.
Good luck!
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Wednesday, September 19th, 2007 AT 4:46 PM

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