alt Hacker NewsNo the DEF systems tend to break down and its mandated the engine go into limp mode when they do, this is hated by those that do not care for emissions and one of the biggest reason to delete by truckers. Also costly to fix the systems out of warranty.
You can find instructions on how to make DEF simulators using raspi's to fool the ECU into think the DEF system is working, people who do care about emissions will still carry these for emergency so they continue on their trip and get to a shop later. The derate was over zealous for sure and was a bad policy.
Also DPF is a performance issue since it blocks the exhaust to some degree, same with catalytic converter with def nozzle so no its not just EGR at all. DPF also consumes more fuel for regens.
2027 diesel regulations was to mandate even more NOx control but also specified manufacturers were required to have 100,000 mile 10 year warranty on emissions systems, its 5 year, 50k now. I believe thats dead in the water now.
A diesel engine with a deleted SCR system puts out 40 times the NOx of a working one. Thats 40 trucks going down the road to 1 equivalent. NOx causes asthma and acid rain, its not for the environment as much as for you directly.
And what percent of diesel emissions are from diesel passenger vehicles?
Emissions reduction efforts would be better spent ensuring repairability. The sunk cost emissions of landfills filled with junk created by planned obsolescence is much worse.
Diesel pick ups are not practical vehicles. Let's be honest, it's a hobby. It's always going to be niche and cutting down the last 10% is always the hardest. General aviation still uses lead.