P1421 & P1423 Codes
I still need your help. The P1421 & P1423 codes still come back on after every 4-6 starts. You can hear the air-pump running plus I've replaced the pump, the control valve and the relay. It is a 2000 528i with 116000 miles and runs well. It's just the cotton-pickin' check engine light. I f you have ANY ideas, please let me know.
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