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BMW
528
Trouble Codes
P Codes (Powertrain)
P1400 - P1499
P1421
P1421
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
MERLIN2021
EXPERT
P1421 Secondary Air System Bank 1
This is what i come up with...
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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