From the workshop manual:
DIESEL PARTICULATE FILTER (DPF) CONTROL - VEHICLES FROM 2008MY
Vehicles from 2008MY are fitted with a diesel particulate filter (DPF) which collects the particulate matter produced during the combustion process and reduces the particulates entering the atmosphere.
The DPF is located in the exhaust system, downstream of the catalytic converter. A major feature of the DPF is its ability for regeneration. Regeneration is the burning of particulates trapped by the filter to prevent obstruction to the free flow of exhaust gasses. The regeneration process is controlled by the ECM and takes place at calculated intervals and is not noticeable by the driver of the vehicle.
For details of the DPF and the regeneration processes refer to the relevant exhaust system section. For additional information, refer to: Exhaust System (309-00C Exhaust System - TDV8 3.6L Diesel, Description and Operation).
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