3 Years In some truck, this process may be done by an oxidizing catalytic converter that should also be checked and cleaned as needed. These components can present a variety of issues with different solutions for each, so further research is needed to determine if the forced regen is the answer. What is face plugging? Parked regen is just a regen while parked. How to Bypass the DPF Filter on Cummins Engines? reply reply. // ]]>//