How long do I need to drive at speed to get the DPF to regenerate?

I owned an Evoque that had issues with the DPF. But when a diesel flags up that the DPF needs a regen, how long time or distance wise do you have to get it on a motorway/dual carriageway before the fuel is dumped into the sump? Would it not be better for drivers to have a gauge so they can plan ahead for it?

Asked on 25 May 2019 by Colin

Answered by Honest John
Because the DPF is under the car, not 'close coupled' in the exhaust manifold, the car needs to be driven quite a long way (50 miles) at 2000 - 2500 rpm to get the DPF hot enough to promote a passive regeneration. An active regeneration will happen automatically, but if the DPF is too stuffed up with soot for this to work, the post-injected diesel intended to fire off an active regen will instead sink into the sump.
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