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Engine & warning lightsCode P0420: Read This Before Buying a ConverterAn exhaust leak ($60–$200) or a lazy rear O2 sensor ($120–$350) throws the same code. Cheapest-first checklist.Engine & warning lightsP0420 Code: Catalyst Efficiency Below Threshold — the Real CausesExplaining the P0420 code and its multiple causes not always tied to a dead catalytic converter, with proper diagnosis before replacement.