P0420 – Meaning, Causes, Symptoms, & Fixes – FIXD Automotive Code P0420: Catalyst system efficiency below threshold (Bank 1). P0420 can be caused by bad O2 sensors, a failing catalytic converter, or a leak in the exhaust system. See here for a step by step guide on how to diagnose and fix code P0420. ALLDATA Tech Tips & Trends Blog Pro Tips & Automotive News For premier service and diagnostic solutions, look no further than ALLDATA. ALLDATA, an AutoZone company, provides the repair solutions your shop needs to service any vehicle, and AutoZone provides quality parts delivered fast.

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