ranhood

Gang - good day to all! I bought my daughter an 2012 A3 TDI (2.0) about 4 yrs ago. Yesterday DPF warning light illuminated. I'm researching what mods were done as part of VW compliance. Does the car still have a DPF? I understand no DEF is required, why would that light illuminate? Was the mod software only to the car? I'm a not sure where to start searching!! =/ I'm very handy on cars but never owned a diesel! Thank you all kindly! Need your help