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Re: Slow 02 response 2013 Silverado 5.3 4X4
Posted to Technical Discussion Forum on 1/22/2020 9 Replies

Hi Louie.

As Geoff says, those codes are for sensor response lean to rich. The ECM forces the mixture rich and then watches the sensor responses to see how long they take to indicate rich.

If the engine is running lean to begin with, those codes can set, so... Login to read more.

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