P0420 and P0430 Codes - Diagnose & Fix Engine Codes - 1A Auto
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P0420 and P0430 Codes - Diagnose & Fix Engine Codes - 1A Auto
So your check engine light is on and you're getting a P0420 or P0430 code on your OBDII car scanner? Learn how to diagnose and fix a clogged or malfunction catalytic from our mechanic.
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How to fix PO420 code (Cadillac)
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