I have an A3 170ps TDI 48,00 miles. Had to have the DPF removed 6 months ago no problems with limp mode etc since. Other than a bit of blue from the exhaust on start up when its cold typical diesel. 3 months ago I made the decision to have the injectors changed under Audi recall no problems since. But out of the blue in the last week my car has started throwing lots of black soot out the exhaust. Never did it before.