Hi, if you read page 273 of the UK handbook it will explain to you the procedure , to goathland, your mileage equates to virtually 300 kms so I would expect that you are doing quite short journeys, and may have interrupted a DPF regen, if you follow instructions in book it will clear, it can be awkward to find suitable road conditions to follow procedure exactly, but I have found that if you select a lower gear manually, so that you keep engine at suggested revs, it will clear with less distance travelled. Hope this helps, Tony