Fourth time now , dealers says its sensor related and doesnt harm the car and it only takes them about 40 minutes to fix it but since the warranty is up in October its time to get a permanament fix

Is there one???

Car lives the perfect life for DPF functions i would think , its on a fast dual carriageway within 5 minutes of leaving home and then does 30 miles on the motorway , same trip home again 5 days a week

Then surely they should replace the sensor?!

Car in warranty + car not totally right = car gets fixed.

Simple!

I think they have replaced it once but cleaning seems to solve the problem for around the same time , perhaps every 8000miles or so this happens