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Replacing Catalytic Conv. Rx300, 2000

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I have a 420 code and have replaced all Air flow sensors. I am now considering replacing all three Catalytic Converters. What is the best proceedure? Where is the best place to get the converters and gaskets? The SUV has 188,000 miles any other suggestions on what to replace at the same time?

All advise is welcome.

Thanks a millon


2000 RX300

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