P1421

BMW 528
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FLEETSIDE59
  • MEMBER
  • 1 POST
2000 BMW 528I CODE 1421 KEEPS COMING UP
BY ENGINE RUNS FINE
Sep 19, 2007 at 9:27 AM
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MERLIN2021
  • ✓Experienced Mechanic
  • 17,250 POSTS
P1421 Secondary Air System Bank 1 This is what i come up with...


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

This is the troubleshooting flow chart for it. Good luck!
Sep 19, 2007 at 9:46 AM
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