Started out today with a 2011 Nissan which was taken to a local Garage with the customer saying there was no power . We did a pressure check on the dpf and it was at 8 psi at Idle and over 30 psi when reved . So blocked it blew our pipe off. After a good clean it was back down to a reasonable 1.8 psi at max revs . We then went and did John's 2009 Audi A3 1.6 which was in limp mode due to a slightly blocked dpf. While there we took a look at the egr system and found it was not in a good way so wa

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