P0420? It Might NOT Be the Catalytic Converter!
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YouTubeMaster Automotive Training
P0420? It Might NOT Be the Catalytic Converter!
A P0420 doesn't always mean you need a new catalytic converter. A lazy air-fuel ratio sensor can send bad data to the PCM, causing incorrect fuel control and triggering a false catalyst efficiency code. The best diagnosticians test first—then replace the right part. 📍 Master Automotive Training – Rancho Cucamonga, California 🔧 ...
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