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Causes and Fixes Toyota P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1)
How to fix a Toyota P0420 Code, "Catalyst System Efficiency Below Threshold (Bank 1)." Link to Cataclean on Amazon: https://amzn.to/3TSI6xW Possible Causes of a Toyota P0420 Code A failed catalytic converter A faulty oxygen sensor Damaged wiring and loose connections Exhaust leak
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