In order to meet stringent emissions regulations, introduced in 2009, all new diesel vehicles are fitted with an exhaust filter. These are also known as Diesel Particulate Filters (DPFs). Vehicles equipped with a DPF have more efficient emissions control. DPFs efficiently capture and store particles from exhaust gases, helping to lower tailpipe emissions.
Some driving conditions, like frequently driving short distances or in slow-moving traffic or in cold weather, may not provide sufficient opportunity for regeneration.
When this occurs, a warning light displays in the instrument panel.