Recent content by CrankMaster

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    P20EE Code and DEF Issues: Is it a bad injector or a clogged cat?

    My 2015 is throwing P20EE (SCR Efficiency Below Threshold). The truck runs fine, but I can’t get rid of the light. I’ve cleaned the DEF injector, but it keeps coming back. Is my SCR catalyst cooked, or is there a sensor I’m missing?
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