According to records filed in the case, Achtemeier conspired with mechanics in garages and operators of truck fleets to disable the anti-pollution software installed on diesel trucks.
Coconspirators who wanted to disable their trucks’ pollution control hardware system—a process commonly known as “deleting”—sought Achtemeier’s help to trick the truck’s software into believing the emissions control systems were still functional, a process known as “tuning.”
Monitoring software on a deleted truck will detect that the pollution control hardware is not functioning and will prevent the truck from running. Achtemeier disabled the monitoring software on his client’s trucks by connecting to laptops he had provided to various coconspirators. Some of the coconspirators would pass the laptop on to others seeking to have the anti-pollution software disabled on their trucks. Once the laptop was hooked up to the truck’s onboard computer, Achtemeier could access it from his computer and tune the software designed to slow the truck if the pollution control device was missing or malfunctioning. Achtemeier could “tune” trucks remotely, which enabled him to maximize his environmental impact and personal profit.
I actually decided to search this because I thought the whole point of DEF was so trucks wouldn’t need to use an EGR like every car does.
Apparently emissions is complicated and expensive lol, so lots of trucks have both.
Newer models however have started creating systems that remove the EGR and instead rely solely on the SCR with a bigger DEF tank and a cleanup catalyst.
I think DEF is still the right direction. Exhaust recycling has a ton of downsides that took car OEMs a while to hack their way around (or give up and plan for 150k mile expectancy).
4,500 for a mod though is still pretty expensive for something you can do yourself. Most of that cost was probably due to it being illegal, not because it’s hard to accomplish.