hi i have a 2.2 hdi est 2001 model, the other day i thought the exhaust was blowing at the manifold area as i was hearing a noise in the engine bay, after removing the top covers ive noticed the noise such as (air) hissing from the 3rd injector and noticed im down on power i havent phoned citroen yet about this. i s this a easy job or does the injectors need resealing im so confussed what to do. im a little worred as i heard sometime you cant get the injectors out, ive noticed the 2 allen key bolts beside the injectors and was wondering is this the seal its leaking from. please help. ps, great forum my first day on here best regards dale