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Yes, thanks, John, I did find the info on testing the O2 sensor in the FAQ, after posting my message. I dutifully followed all the steps and determined that my old sensor was bad, so I replaced it. The problem seemed to be fixed, I cleared the error codes, and the car ran properly with no more "check engine" light.
I was congratulating myself on having saved all sorts of expensive parts and labor being thrown at it by an auto repair shop when I went to start the car this morning. Guess what? the problem is back again. So now I'll go back and do what I probably should have done in the first place, and clean all the connections per Guy W.'s suggestions.
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