Looking to buy A5... slight issue though

[Lewwwiss]

BMW owner here Haha. Looking to sway over to audi.. found a banging A5 which I'll post the link up for you guys to see. Only issue is it has DPF light on... is this a common issue for the 3L? Is it a sensor just need a Regen or is the dpf shot. Any help with this specific engine type and things to go wrong and look out for will be appreciated..

Thanks

 

https://www.autotrader.co.uk/classified/advert/201811242710623?advertising-location=at_cars&transmission=Automatic&year-from=2010&postcode=gu479bq&body-type=Estate&body-type=Saloon&body-type=Hatchback&model=A5&page=1&make=AUDI&onesearchad=New&onesearchad=Nearly New&onesearchad=Used#db-tab-2