I was working on those DEF systems before I retired last year.The main thing is for the tech who works on it to be very sharp-familiar with the system.A lot of times, a tech cannot duplicate the problem without extensive test drives-the first shop may have been hesitant to replace a part,that may not fix the problem.The system is complex,each engine manufacturer-even on the same truck-has a different set up.Sometimes a lot of diagnostic tests must be performed to find the cause of failure.It seemed like there was about a thousand fault codes that could occur,between the engine and the DEF system.Keeping the DEF tank clean is a must-we had to remove quite a few and clean them out.There is a DEF filter that must be changed just like you change your oil and fuel filters.We had one truck that forever was having problems,fix it and a month later another problem.Usually that was not the case,however! Good luck,I hope they got it!Mark
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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