What triggers dpf regeneration If you’re not 100% familiar with how diesel particulate filters work, you should definitely take a look at this article How Diesel Particulate Filters Work.What can prevent normal regeneration from taking place?The single biggest cause of incomplete DPF regeneration is the duty cycle of the vehicle.
2015 Forester turbo diesel. Car appears to have blocked DPF. DPF light on and flashing. Car in limp mode. Trying to do a forced DPF burn via scan tool, but estimated DPF temp is too low to initiate regen cycle. Car driven and temp will only go to 260°C. Before running the car, DPF estimated temp was reading -40. Passive Regeneration: This occurs when you are driving your vehicle. To trigger this process, you must drive the vehicle for at least 15 minutes and at 40 mph. When you do so, the exhaust heats up and starts burning the soot off. Active Regeneration: However, if you do not succeed in triggering passive regeneration then active regeneration FYI, there's no such thing as a level 1, 2, or 3 DPF regeneration. This nomenclature is simply incorrect. There are three ways the DPF will regenerate. I'll give a very brief description below. 1. Passive: when EGT's are high enough (no fuel is injected). 2. Active: when ECM commands fuel injection with exhaust stroke (65-90% soot level) 3.DPF as a Regeneration Enable followed by a drive. Please perform a service regeneration if instructed to by service information. As a rule of thumb, if a vehicle has less than 70% DPF Soot Accumulation, do not perform a service regeneration unless instructed by Service Information. Note: If you are concerned about the DPF SootThe next suggestion was to force a regeneration to try and bring the ECU back into alignment. On the previous 2 occasions the dpf light has been triggered by the ECU I have driven it literally 100’s of miles on the motorway and it will not go off without a forced regen by the garage. David. mecLT.