Hi
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2. check the DPF pressure sensor pipes are clear - if you have access to a hand vacuum gauge you shouldn't be able to create any vacuum, if you can it's blocked, clear them out.
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Also check the rubber pipes aren't damaged.
Although mine looked intact, one had burnt through (near to the DPF) but looked intact because of the outer protective sheath / covering. It was allowing some pressure to go through to the sensor but not the full pressure. Therefore confusing the system.