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Old 01-26-2017, 10:12 AM   #3
somick
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Re: P0420 - Corolla 01

I do not know about your 01 but Toyota's P0420 code means cat efficiency is below 95%. Before spending money on a new O2 I would try to install anti fowler (about $5 on Ebay), clear code and see if it comes back.

Good luck,
Sam
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