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Re: Emmisson Monitors
Posted to Technical Discussion Forum on 7/29/2025 4 Replies

Here are the codes that will prevent the Cat from running.

DTCs P0420 - Catalyst System Efficiency Below Threshold, Bank 1 (or Y-pipe), P0430 - Catalyst System Efficiency Below Threshold, Bank 2 Monitor execution once per driving cycle Monitor Sequence HO2S ... Login to read more.

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