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P0420 Error Code Plan Of Action Please


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2001 RX300, 80k miles. Getting error code "catylyst efficiency below threshold bank. I'm having a hard time believing the cats are bad at this mileage. Thinking about replaceing the rearmost A/F sensor, and then perhaps the others if that doesn't work(?) Comments please? I notice several brands are available. Any thoughts on the brands? First post to the forum. TIA

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