Background The Turbo Diesel Register editor called me a couple of months ago asking some questions about DEF systems. It seems that the folks at Geno’s Garage had been seeing an increase in phone calls related to the high cost of repairs to their DEF equipped trucks, specifically for the DEF emissions components. After our conversation, I did not give it much more thought and was going to cover another topic in TDR Issue 102. It just so happened that I was going to look at a customer’s car in…