Engine Light, Engine Care, Check Engine, Check Engine Light Diagnostics, Emissions Systems, Catalytic Converter Diagnosis Benjamin Mead Engine Light, Engine Care, Check Engine, Check Engine Light Diagnostics, Emissions Systems, Catalytic Converter Diagnosis Benjamin Mead

Why is my check engine light on? Code P0420

P0420 means your vehicle has detected catalytic-converter efficiency below the expected threshold on Bank 1—but it does not automatically mean the converter is bad. Learn how misfires, fuel-control problems, exhaust leaks, oxygen sensors, oil consumption, and other faults can cause P0420 and how the system should be properly diagnosed before expensive parts are replaced.

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