How do I tune out downstream O2's on 98 SS ???
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My 98 SS keeps throwing code P0420, and I've been told by members of this website that the best action to take is to tune out the downstream o2's. I have Flowtech long tubes, with custom y (with high flow cats), and flowmaster cat back. Entire exhaust system has less than 3k miles on it. Have already replaced both upstream sensors. How do I tune out the rear o2 sensors? Is this something that can be done with a handheld programmer/tuner?