Injector seals
Nope 10 minutes, whip the injectors out and there is a lower and higher seal, think they were £4 EACH (you could just find which ones and just replace those, but i'd do them all) and to be clear you need 2 for each injector
dont buy them from VW they are a rip off! u can buy them direct from bosch for like 80p eachi got mine from ebayhttp://www.ebay.co.uk/itm/250820206032?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649