Own a Audi A4 avant s-line on an 07 plate. Dpf warning light is on and keeps turning into low power mode. Been diagnosed, and was informed that wasn’t clogged with soot. But could be a sensor. So with advice from garage at a risk. We put a new one on. How ever, all lights back on and performing back in low power mode. Any advice before I pay out to have a full dpf clean? (As said, was informed it’s not clogged)