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How do I get rid of my van's DPF warning light?

I have a 2015 Volkswagen Transporter T5. The DPF warning light has come on four times since last December. I do a lot of short journeys, but try to do a long journey once a week. Three weeks ago I travelled 120 miles over two days, then the warning light came on two days later. But I get no warning light after several short journeys. I do regenerate the filter by driving at 2500 revs in fourth gear and the light disappears. What can I do to mitigate this problem?

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Generally speaking a modern diesel with a DPF needs at least 15 miles per journey to keep the DPF in good physical shape. This is because the system needs to heat up and burn off the harmful particles that are trapped in the filter - failure to do this usually results in the filter clogging up. The DPF on your van might simply be full of ash and soot; it might be possible to chemically clean it using Ceramex. Otherwise it’ll need replacing.
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