Hi all, can someone point me in the right direction on how I can test my map sensor using vcds and I how I can test for vac and any boost leaks, my car is randomly going into limp mode and have to cycle the ignition (usual story)!!, Had this prob last year so stripped and cleaned turbo/inlet man completely and replaced Maf /checked all boost pipes for splits/ egr blanked off and all seemed good but prob has returned. I scanned engine and getting 17965 charge pressure control/positive deviation/intermittent/ just wondering if map sensor could play a part in all this but don't want to go replacing parts willy nilly, this has turned into abit of a brain drainer!!, Any help will be gratefully received. (2004 Audi A4 b6 1.9tdi quattro 174,000mls)