My PDF warning light came on, I was quite displeased. I was warned for my purpose, I should not be getting a diesel, due to the short distance. My relatively short distance drive is relatively steady and can sufficiently warm up the engine. In additional to my weekend long haul driving, I was confident to keep the exhaust clean.
I now suspect the cold snap contributed to this fault. On the cold days, I was not able to bring my engine up to temperature. And it did not help when I did not do any long haul driving for weeks.
As soon as the light came on, I did what Andy suggested, a high rev flush, and the light later disappeared. Lets hope this weekend's drives will clear it all out.
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