Question: I just bought a used 2002 Toyota Corolla, and the “check engine” light is on, which I took to mean there was a trouble code stored in the computer. The scanner gave me code P0420, which I ...
Answer:That's a new one for me, and I cannot see it having any effect on preventing a P0420 DTC, but it is illegal. P0420 indicates the catalytic converter has lost its efficiency in reducing harmful ...
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