There's no need for any of this. DEF diesel engines already go into limp mode not long after the fluid runs dry (after ignoring many warnings). There are sensor

There's no need for any of this. DEF diesel engines already go into limp mode not long after the fluid runs dry (after ignoring many warnings). There are sensors such that just replacing with any arbitrary diesel-compatible fluid won't fool it (thought that would be stupid to do). And most states have annual inspections that include emissions, you would not pass with a dry Adblue tank. No need for dramatic exhaust; the cops can run your plates and see your inspection is expired.