We simply won't know how much ash the increased DPF regenerations create until we start hearing of NOx fixed EA189s that have needed new DPFs. "As a respected journalist" I have reported every single instance of problems people have reported to me in www.honestjohn.co.uk/carbycar and will continue to do so. If what I have been told is "a pack of lies" it will be exposed by this process. The precise detail of the software fixed for the 1000 or so permutations of cars and engines are not relevant. All that is relevant is whether they work and whether the vast majority of NOx fixed cars deliver the same power, torque, fuel economy and emissions as they did before. If they don't for a small minority of cars the reasons could be pre-existing wear and blockages in the fuel and emissions systems. We'll find out.