I would just change the DPF pressure sensor located in the middle of the bulkhead in the centre make sure you put the pipes on the right way round and you will need to reset ECU with multiscan after its been replaced also make sure the 2 small metal pipes from the DPF aren't blocked as this can also cause problems
No the DPF is the large box before the silencer box under the van, the sensor is slightly behind it, find the part on the internet to see what it looks like
Correct , oil counts down so at 8% your oil is actually 92% degraded
Suggest an oil change may be best and see how it go’s from there, however don’t forget to reset the service / oil change parameters otherwise you’ll be wasting your time
The 80% clogged is probably just the current state of clogging in the DPF filter, as it nears 100% clogged it should perform a re-gen which will clear the filter and that number should come right down. My van has just done this and went from 96% to 19%.
No the DPF is the large box before the silencer box under the van, the sensor is slightly behind it, find the part on the internet to see what it looks like