If the vehicle is not driven in a way that automatically regenerates the particulate filter, it will build up an excessive amount of soot, which, if not resolved, will reduce the performance of the vehicle and damage the filter.
If the filter does build up too much soot, a vehicle warning light will appear to alert the driver. The problem can usually be resolved by allowing the filter to automatically regenerate until the warning light goes out – i.e. by driving the vehicle at 50mph or above for at least 20 minutes. The vehicle handbook will have specific guidance for the vehicle.
If traffic conditions and speed limits do not allow the vehicle to be driven so that the filter regenerates, it will have to be returned to a dealer for a forced regeneration to clear the filter. If the warning light is ignored and the vehicle is driven without regenerating the filter, it will cause damage to the vehicle, which will not be covered by warranty or our maintenance agreement. We are aware of businesses in the UK who have incurred costs in the region of £1,000 to £1,500 after a driver has failed to follow the correct regeneration process.