Hi All Just joined today Owner of 2ltr Diesel Sportage Had for 9 months So far so good Had burning smell the other day coming from under car Contacted dealer and was told it was the self cleaning system for the exhaust Anyone else come accross this?
The "cleaning system" is the DPF or diesel particulate filter, some cars have had them for years but its now a legal requirement for all new diesels to have them fitted. When the canister becomes filled to a certain amount sensors on the car activate a regeneration which burns off the soot particles at a temp over 600 degrees centigrade, this is done by injecting the diesel late into the cylinders and the unburned fuel passes directly into the DPF, burns and raises the temperature. If a car is only used for local short runs the DPF will become clogged since a regeneration will not be activated, if warning lights are ignored the DPF becomes useless and has to be replaced, cost is sometimes over £1000. To keep the system heathy cars fitted with DPF's need to be used for decent runs fairly frequently to allow the regen conditions to be met.
With our Ceed the car gets used probably 30% in town and the rest on open roads. A regen occurs approx every 300 miles and lasts about 15 miles. During the regen you may notice a smell of burning, lumpy idle, increased engine noise during acceleration and increased fuel consumption. These are normal and noting to worry about. Now the car has done over 6000 miles and carried out probably 20 regens we hardly notice them to be honest, just part of the modern motoring experience.
Our BMW gets similar use to the Ceedalso has a DPF and as above after 3 1/2 years we hardly notice regens.
Basically if you only use a car in town a DPF equipped diesel is really bad news, if you use it what I would call normally you will probably never be aware of the DPF other than the minor changes noticedduring a regen.