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Message: <blockquote data-quote="OptimistPrime" data-source="post: 360459" data-attributes="member: 44207">I seem to remember having this O2 sensor replaced at one point. It's not OEM. I had to have like $900 bucks worth of work done to the car for it to pass its very last emission test, and the sensor was one of the things they changed. Thing is, the light hardly ever comes on with the sensor plugged in. Even with the car totally messed up and not accelerating it has no light. Maybe once every few weeks I've spotted it come on for a second, but then it's gone again. Part store scanners can't diagnose it since it's an OBDI car. And yes, it's gotten lousy mileage for a while now. Oh right. I forgot about that. I'll have to google it. I think it's the farthest on each side that need to be shorted. But I have no idea how to translate what the flashing means. Maybe there's a listing somewhere online.</blockquote>