Originally Posted by crystalworks

I spliced in an old O2 sensor on my bank 2 post catalyst (driver side) location I had here lying around. It is older than the one that failed but should work until the replacement sensors get here. It came off a 1991 318is coupe so we'll see if the sensor will give me a few weeks of no CEL until can replace all 4 of the O2's as @ 115k they are all a future point of failure at this time.