The DPF light keeps coming on in my car, despite driving it properly - what do you think?

I bought a 2006 Hyundai Tucson in October 2017. The engine warning light was flashing when I test drove it and I was told that this was the DPF. I was aassured it would be fixed and it was okay when I collected it, but has been back twice for the same problem and the last time (30 November) a full regeneration was done by a specialist. The light has now come on again (150 miles later) and the garage are saying I am not driving it far enough, which seems ridiculous. I have read up about DPFs, but can't believe that it would need cleaning out again after only 150 miles, which included several half hour trips at 40 - 60mph and a blast down the motorway at 70mph for about 20 - 30 minutes. I would be grateful for your comments.

Asked on 26 January 2018 by Cathy Rooney

Answered by Honest John
It's probably full of ash from burning off the soot and because it it too full of ash it can no longer regenerate properly. Might be possible to have the DPF chemically cleaned by sending it away to Ceramex for about £400. Otherwise it needs a new DPF, which will be about £1000.
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