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 4:27 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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MERLIN2021
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 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 4:46 PM
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