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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.Fault codeP0420 — Catalyst system efficiency below threshold (Bank 1)P0420 means low catalytic converter efficiency. Learn the real causes before replacing the converter, plus realistic repair costs.Fault codeP0141 — O2 sensor heater circuit malfunction (Bank 1, Sensor 2)P0141 covers the sensor after the catalytic converter. How it differs from P0420 and what the repair really costs.Fault codeP0430 — Catalyst efficiency below threshold (Bank 2)P0430 is the Bank 2 twin of P0420. Work from exhaust leaks to sensors before condemning the converter.