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Well; I'd bet the 25 year old o2 sensors have finally given up. The post-cat sensors are used too. I usually swap the primaries to the secondaries, and put new ones on for primaries. You can clear codes by pulling fuse 15 under the hood, and trying to start the car.put the fuse back in, and start the car. Do the drive sequence, and see if it sets the code again.
