I just saw DPF light mentioned here - what is that light?
The reason I ask, is that I have never seen it on, not even when DPF regen is active.
Should it be shown when dpf regen is active or only if issues are detected?
DPF light looks like a little exhaust box in orange on the dash.
It only comes on if you don't let the regen finish a few times and the DPF filter gets blocked over a set percentage.
The official way to clear the dpf properly is to do a steady speed ( over 40mph ) with revs between 2000 and 2500.
The above driving conditions allow the ecu to alter the fueling so the exhaust gas is as hot as possible to burn off the soot in the DPF
The fans running flat out after you switch off are a sign that you have just interrupted a regen.
Engine idle raised to 1000rpm or slightly above when stationary is a sign that a DPF regen is in progress.
One of these days the clowns will put a light on the dash to tell you a regen is happening so you could alter your route and let it finish.