Purchased a used 2017 Nissan Titan XD Pro-4X 5.0L diesel on 3/8/25. Left the dealership and only made it ~10 miles down the road before the check engine light came on and there was a loud knocking noise. Immediately turned around and went back to the dealership. After diagnosing it I was told it was a fuel injector and that they were replacing it. Received the truck back ~3/20/25. This truck is not my daily driver but the few times I have attempted to drive it the check engine light keeps coming on and I’m getting a message about the REGEN. On 5/28/25 I had the truck towed to my local Nissan dealership. They diagnosed it and although there is still a code for the same injector coming up they said the issue is the wiring harness and quoted me $7000 to repair and it’s not covered under my powertrain warranty. After research it seems like this is a common issue in 2017-2019 Nissan Titan 5.0L diesel trucks which will cause the crankshaft to break if not fixed. I am super frustrated that after less than 3 months of ownership I have an undrivable truck requiring thousands of dollars in repairs.