Sorry to revive this older topic, but experiencing similar issues with my 2010 X5.

Just got back from dealer and they claim the DPF filter needs to be replaced. Seems to me, the vehicle just can't do a regen to clear this out.

The specific questions I have are:

CEL is on and generic OBD II Reader throwing P14A7, which points to DPF. I assume just resetting this code will not force it to perform a regen?

Along with CEL, the DPF light comes on after about 5 minutes of driving with warning of reduced power. What exactly does this light tell me? (That regen cannot take place? regen will take place? system is at end of life and will not function anymore?, etc.). I assume this message is being triggered from the pressure sensors on the DPF mentioned in this thread.

Pressing "OK" makes DPF message go away until reappearing on next start.

OBD II reader also has a dashboard, reporting 140F engine temp during long hwy drive. Is this too low? It's possible that this isn't accurate. I specifically mentioned the thermostat and BMW said it wasn't an issue. Are they just reporting what their scan "DIDN"T" tell them, or is there something on their scan that can report the health of the thermostat?

With the "sacrificial hose" trick mentioned in this thread, must I use a specific tool (Rheingold, Carly, were mentioned) to specifically request a regen? Is resetting the error codes enough to trigger a regen using this method?

They suckered me out of a grand to fix glow plug module and a plug (I knew these were bad going in) to get down to only the emissions issues. So, I'd like to find a way to resolve this without dropping another 2K+ to replace the DPF.

Any other tricks to get regen to fire would be helpful.

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'10 X5 3.5d, White and Tan
'01 X5 4.4i, Black and Tan, SOLD