P0420 And Bad Gas Mileage

16 Nov 2023

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Weird, inconsistant p0420 situation. fluke? bad gas? elevation

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Engine codes P0430 P0420 and P1143. Loss of power, poor gas mileage

Cheap catalytic convertor getting p0420 same gas mileage

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Bad mileage and p0420 and p0430 on, obd2 strangeness

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Can a bad gas cap cause a P0420 code? - Quora

Bad gas mileage diagnosing poor car and truck fuel economy

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