This is the first dpf cleaning for this truck with 477,000 miles at 22,000+ engine hours! Truck had no emissions problems or any lights on the dash.I do not claim to be a pro at emissions, but I have done quite a few. Iv learned all this by myself so if you see something that you learned or would do different let me know! My goal is to maybe help others with stuff like this and maybe learn more on the way, and save some people some money!