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Same problem hunting down P0420 on '02 $cyl Camry. Two years ago when got code ended up replacing both cats, both sensors, and manifold. Two months later code came back. Garage replaced forward cat again. Six month after that, code again. Garage said parts no longer under warranty because they were aftermarket from parts store, not a dealership. After a couple weeks CEL went off. Now it's back, just in time for inspection. Finding it hard to believe it is eating converters, or sensors for that matter quite so fast. Suggestions?
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