?Technician A says that a restricted DPF does not usually trigger limp home/derate until it is 95% plugged. Technician B says that a DPF that is 95% plugged almost always has to be replaced. Who is correct?

Question

Quizplus · Accepted Answer

Technician A is correct because DPF systems typically have sensors to detect when the filter is becoming clogged, and they often don't trigger a limp home mode or derate the engine until the blockage is severe, around 95%. Technician B is also correct because at 95% blockage, the DPF is often beyond the capacity for regeneration to clear the blockage effectively, and replacement is usually necessary.

?Technician a Says That a Restricted DPF Does Not Usually