Not all TDI that were part of the emissions mess use urea, they also have a system that injects diesel into the particulate trap and burns out all the particula

Not all TDI that were part of the emissions mess use urea, they also have a system that injects diesel into the particulate trap and burns out all the particulates at high temperature. Look up DPF regen. Note: I owned one of these cars, this is firsthand knowledge.