Hi, Vito 111 55 plate. Noticed some whiffs of fumes recently, took air filter off today and injector number 3(or poss 4) is leaking. I already fixed injector 1 last year Because the injectors are arranged front to back, injector 1 was easy to access but 3/4 look a lot harder! Has anyone managed to replace the seals in these without removing the engine? Or am I better to take it out and replace all three while i'm there? Cheers.