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Your 02 sensors are probably going flaky, just reset the computer right before you go to get tested and have it done. Won't hurt anything, other than the fact that you will get crappy gas mileage. If you want to fix the problem go to checker/kragen/napa and get a new set of 02 sensors for like $60 each and screw them in... the old ones look like little towers sticking out of the exhaust tubing after the manifolds. Bank 1 is probably drivers side, and bank two is passenger. If you are getting a rich condition, it will probably be the downstream (after the cat) sensors that are failing, but check the codes to make sure which one it is, and replace any as necessary. Good luck.
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