This is really really simple. Your DPF is blocked beyond a forced regeneration being possible. The sensible option is to buy a new DPF filter. There are cleaning options but some recommend that and some don't.
Your DPF should have been changed by now anyway. Anything else you try to do is just tinkering round the edges and will not solve the problem.
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Present: 2009 Volvo V50 1.6D DRIVe SE
Past: 2004 Volvo S40 T5 SE
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