Learn to Diagnose and Fix Catalytic Converter Issues
So, your check engine light is on, and you’ve got either a P0420 or P0430 code, on your OBD-II scanner. This “Catalyst system efficiency below threshold” code is triggered when your car’s computer (the powertrain or engine control module [PCM or ECM]) detects a catalytic converter issue.
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Check Engine Light? Catalyst System Efficiency Below Threshold – Code P0420, P0430
In this video, our mechanic explains how a catalytic converter’s efficiency is reduced when it’s clogged, which triggers one of these two error codes. Watch now: