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Subjects>Auto>American Cars

How do you fix code po420 for Chevy s10 blazer?

Updated: 10/23/2022

Wiki User

∙ 12y ago

Best Answer

P0420 = Catalyst Efficiency Below Threshold (Bank1). Sounds like you probably need to replace the Bank 1 (drivers side) Catalytic converter.

Wiki User

∙ 12y ago

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