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There was a software update for the EGR cooler efficiency code  some years back . You can remove the hose and elbow on the front of the cooler and blow it out with blow gun .  Wear a mask because black soot will fly everywhere. Then replace the EGR temp sensor and clear code . I’ve had decent luck doing that when  replacing the EGr Cooler wasn’t option due to parts availability 

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https://www.bigmacktrucks.com/topic/70441-code/#findComment-509598
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