2012 GMC Denali Code P0420 Fix - Search Videos

P0420 Engine Code | Catalyst System Efficiency Below Threshold (Bank 1) - FIXD

P0420 Engine Code | Catalyst System Efficiency Below Threshold (Bank 1) - FIXD

P0420: Catalyst System Efficiency Below Threshold/Bank 1 is usually due to a defective catalytic converter, but other components can also be involved.

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