I'm in two minds whether to bother getting it replaced or just paying someone to clean it out.
You cannot clean a DPF out, just an urban myth propogated by robbers who charge you for the "service". The particles are chemically bonded to the matrix inside and can only be removed by a regen. You may get a few extra weeks after their tampering but any lights will soon be back on.
However, it may be possible for a BMW garage to carry out a forced regen if the DPF is not fully clogged up, only takes 1/2 an hour with a computer controlling the engine. But it will only work up to a certain point, if you have been driving for a while with lights on it will be useless trying.
There are companies out in the world who are able to clean out HGV and heavy plant DPF's. They place them in a special oven, heat them to 600 degrees to burn off the particles bonded to the matrix and while this is happening blow compessed air through to remove the residue. Takes about 12 hours and probably is not economic or possible on car DPF's.
Having said that maybe this company could help. http://www.dpfgenie.co.uk/?gclid=CLaSueiMlLsCFTLJtAod2TMAyA Same process but they appear to offer it for cars. Anyone willing to take a punt?
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