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BMW CCA 69606
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.....Also, is it unusual for the CEL to reset on its own? ....
It's not unusual at all. Misfire codes in particular will clear CEL on restart, particularly if the misfire is not present on restart and is only a high RPM/engine load event.
It's important to scan while CEL is lit. Drive in a fashion that turns on the CEL and without shutting engine off drive to Autozone and try their scanner.
 
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