You are having this issue because the exhaust and particulate filter need to reach a certain temp to burn off the particulate particles.
As has already been suggested by Mmorton5. Just get on local motorway and give the car a good run at 70mph and if a manual gear box drop a gear. This will help reach temps needed.
Manual regeneration step-by-step guide
First check to see if there are any instructions in the owners manual regarding DPF regeneration. If there is no information in the handbook or if you don’t have access to one you can follow these five simple steps which will work on most vehicles.
1. Make sure that the Engine Management Light is not on and that there is at least a quarter of a tank of fuel.
2. Turn on as many electrical items as possible; air conditioning, lights, heated seats, heated rear window, etc. This will make the engine work harder.
3. Find a stretch of road where you can maintain a constant speed for 30 miles without stopping, i.e. a motorway or a dual carriageway.
4. Make sure that the vehicle is at a normal temperature and then drive in any gear that you can maintain 2,000 RPM at a constant speed, automatics should be placed in sport mode where applicable and the gear should be selected manually.
5. Drive the vehicle at a constant 2,000 RPM for approximately 30 miles.
If you follow these simple instructions the vehicle should regenerate the DPF filter automatically without costing you any money.
However, if the DPF light remains illuminated after attempting a manual regeneration the filter will require professional cleaning.
Joss
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