I'm dealing with the same issue right now. After multiple drives at "40 mph for 20 minutes" I still cannot get the filter to clear. Now it's totally clogged and in the shop ..... awaiting the bill. Any advice?So !!!!! Range Rover sport 2016 diesel ! Need to take it for a needless drive to clear exhaust filter ? So what do I tell police if pulled over asking why I’m out .. do I say this car is not fit for purpose ???