Jerry! I'm assuming you are the same guy as below? OK I will give you the exact location after on Sunday, Yet I highly doubt it is the main Relay, as it is on the E23 if thats bad trust me she whant even humm. :) I'm expecting the issue to be ground oriented, here is why, code O2 sensor const. the only way that could always show as that would be a short. The issue with Johns and your car is way to uneven, thats why I fear a wire issue.