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Re: Slow 02 response 2013 Silverado 5.3 4X4
Posted to Technical Discussion Forum on 1/28/2020

Louis, my experience has been to see heaters are turned on anytime the PCM program sees the need.

I still think the 02 sensors are not the problem, but that it is either running too lean to begin with or the exhaust manifolds are leaking at the rear of the h... Login to read more.