Getting recurring every other day after clearing CEL on my 98 M3. The code comes up at P0412. I have checked and/or replaced all the SAP components with no failures found or other problems. Is it possible the O2 sensor is beginning to go bad and causing this code? thanks

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Hard to say. You would likely have an o2 sensor fault.
When you command the secondary air on, check that the o2 does in fact hold lean.

- Nick