A petrol particulate filter (PPF) works in much the same way as its diesel counterpart, and helps to reduce the harmful pollutants emitted by a vehicle. A particulate filter works by trapping soot and minute pollutants in the exhaust system, and is able to self-clean or ‘regenerate’ automatically when exhaust gases reach a high enough
Very quickly noticed a weird Snare drum noise when engine is cold.. Originally bmw thought it was the fan belt replaced it, then tensioners, replaced them, then finally they figured out it was the cam belt.. Success.. This whole process took just under 1yr!!! 2. Two months later DPF light came on (regularly).. BMW performed a forced regeneration. Try to keep the car happy and the emissions system in a happy passive state, in this state fuel economy is best, and less fuel is needed to dose the dpf. keeps the soot levels low. (best) Active: when the car is doing a lot of city driving and has not had the opportunity to do a regen naturally. It will dump excess fuel to dose the dpf. DPF Regeneration To combat the fact that many diesel car drivers are not driving in a way that allows passive DPF regeneration, many manufacturers have designed an active regeneration process. This takes place when the DPF filter reaches a certain point of gathered soot, and the ECU will provide a fuel injection into the engine to increase There have been numerous reports of DPFs resisting regeneration if they get too full, and requiring a manual forced regeneration. For the DPF to have filled up completely to the point where regeneration was impossible within only 65,000 miles suggests some major bad juju going on there. IA4x9W.