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P0420 code on Toyota corolla 2001 : r/MechanicAdvice

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My 2003 toyota corolla has an code p0420. 212,000. It does have another

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Check Engine Light Code P0420 Toyota Corolla | Americanwarmoms.org

My 2003 toyota corolla has an code p0420 and p0120 at 212,000 miles

Toyota Corolla P0420: Catalyst System Efficiency - Below Threshold