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What's SES code? High in NOX ,huh? If your truck has EGR valve, Try to test it with Vacuum pump. It should stall when you pump it. And check also vacuum during underload.
Try to look visually on your cooling fan, if electric powered only, they should work when it's hot. If connected to Crank Pulley, nevermind.
Last thing you look at? CAT Converter.
 
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