The following applies to the 3.6 TDV8 & presume similar applies to the 4.4litre:
"For drivers who make regular short journeys at low speeds, it may not be possible to efficiently regenerate the
DPF. In this case, the DPF software will detect a blockage of the DPF from signals from the differential pressure
sensor and will alert the driver as follows.
Vehicles with DPF use a high-line instrument cluster to alert the driver to the condition of the DPF via
messages in the message center.
When the DPF becomes full the driver will be alerted to this condition by a message 'DPF FULL SEE HANDBOOK'
accompanied by a handbook symbol. As detailed in the Owners Handbook, the driver should drive the vehicle
until the engine is at its normal operating temperature and then drive for a further 20 minutes at speeds of not
less than 30 mph (48 km/h). Successful regeneration of the DPF is indicated to the driver by the 'DPF FULL SEE
HANDBOOK' message no longer being displayed.
If the DPF software detects that the DPF is still blocked, the message will change to 'DPF FULL VISIT DEALER',
the driver should take the vehicle to an authorized dealer to have the DPF force regenerated."
Hope this helps!
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