Quote:
Originally Posted by Rick V
You can try swapping the sensors but I don't think it is going to help your issue. It is customary to swap sensors in pairs, upstream and down stream but not left and right.
I assume we are talking about the Subbie
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it worked, and i think i know why.
the old sensor, in front, is sketchy. thus the computer is adjusting the mixture based on sketchy information. this information leads to crappy mixture and the cat converter cleans it up a bit, but not enough, and the rear sensor reports this problem. thus, codes are flying all over the place and the computer thinks that the cat is bad. remember, the rear sensor does not affect mixture, it only reports what is happening downstream. if the front sensor is reporting things poorly, but not bad enough to cause a failure, the mixture is bad.
moving the good sensor to the front cleaned up the mixture and the cat converter is able to deal with it properly. the sketchy sensor is still reporting well enough to pass muster, thus everything is hunky dory.