Hi Mark,
Coincidentally, I had a Zafira in today with a blocked DPF.
I heard it coming, from down the road, hissing like a hissy thing.
The rubber hose connecting the pre DPF pipe to the sensor had split with the excess pressure.
One of the DTC’s was for the EGR valve. A quick check of live data showed it staying open.
EGR position, along with air mass nominal and actual readings.
Replaced the EGR valve and took it for re-gen drive.
This DPF had blocked due to the EGR valve staying open, therefore reducing the exhaust gas temperature and not allowing re-gen to take place as the exhaust gas would not reach the high temperature required.

This is one possible reason for your Audi blocking the DPF.

Screen shot of data whilst re-gen in progress below.
Differential pressure of 26 Kpa is with the split hose still in place!!
I had not changed it as I know this Vauxhall system will still re-gen even if there is no pressure signal to the ECU.
As can be seen by the last attemp to Re-generate just 25 KM ago.

(The VAG system reverts to a mileage and hours usage format if it loses any one or more of several different signals.)

Also, due to the pressure, the replacement would only burst or blow off during the drive.
The exhaust temp of 744 Degs C is the highest I have seen so far, previous highest was 660 Degs C.






The second screen shot is from when I got back & replaced the hose.
With the engine at idle this Vauxhall now has a differential pressure of just 1 Kpa, even with a 20% blocked DPF.

Cheers, Tony.

P.S. Admin people, that 'upload image' button works so smooth & easily.