Why has the DPF light on my dashboard come on?
Dave, Bristol, UK
The DPF warning light is an indication that there is a problem with the Diesel Particulate Filter (DPF) in the exhaust system. The most likely cause is that the DPF has accumulated too much soot which is causing back pressure on the engine. The soot needs to burn away to clear the filter (a process known as Regeneration). This will happen when the exhaust gas is hot enough. It’s a good idea to act quickly in this case to prevent the filter becoming even more blocked up (such that a trip to the garage is necessary). A ‘fast’ drive will help to get the exhaust temperature up; 40mph (60km/h) for 15 minutes or longer (engine speed about 2000 rpm). The process may be helped by using a reputable branded ‘DPF Cleaner’ fuel treatment, which contains chemicals that help soot to burn.
You can find more information about the possible causes of DPF problems on this page: DPF Problems – Possible Causes