Once again, my 2.4 Brera has failed its MoT on visible smoke. This happened last year but some diesel cleaner and a regen whilst on a run up the M5 seemed to satisfy the test station, though it was a different tester. Now it has failed on visible smoke again, despite having passed the emissions with flying colours. I searched the forum but all the posts on this issue seemed to go back to May/June last year when the new regs came in. Am I the only one that has this problem? Is there a solution or do I need a new dpf? I can't understand how it passes the emissions test but still has "visible smoke". Any advice would be much appreciated. Mileage is only 77,000 so it should be good for a few years yet.