After a month and repairing my ECU I’ve now successfully reset every monitor with exception of Oxygen Sensors. I’ve driven over 360 miles and need to reset the last one to get my smog certification and complete my CA registration. We passed all the emission tests but failed due to battery being replaced and all monitor test settings incomplete. Can someone suggest what I need to do.to get that last one done. I’ve read the Drive Cycle procedures but my shop says that procedure is for AJ27 and later, mine is AJ26.There has to be a better method.

 

Probably worth checking OBD live data, especially fuel trims, and pending codes, in the hope of clues.

Chances are your car has something near or out of spec.