I am new to diesel so please excuse me if i dont seem as knowledgeable as most of you. I recently had a cel come on and got the code read and it was p040d. Now i have a 2011 2500 which has egr delete afe intake horn and 5inch tubo back exaust. Now i dont understand whats going on here. If someone could help shed some light on my issue it would be greatly appreciated.
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