hi there can anyone help i have a mazda 6 whitch has a dpf fault, its bean in to mazda for the problem and they convinced me it was the oil and filtter because it wasn't there oil and filtter i put it in for a service and then regenarat the system. then i had the car back, 1 hour later the dpf and engine managment light came back on a few hours past and all lights went back off. a week later all yhe light have reappered. i have spoke to mazda they advised me to bring the car back in they think it needs a new dpf aprox £1500 can anyone tell me if there is a way of fixing this with out that expense?