Got an 806 thats giving me some problems. Engine management light was on. Got the AA out. 2 problems that came up were "inlet on the turbo", and "air mass sensor". Once the light was reset it never went back on. Now I have power problems. I can be doing 70-75 mph on the motorway, and as soon as theres an incline in the road my 806 slows down. My mate reckons its the air mass sensor, as he disconnected a plug and the engine never dropped any revs. But i don't wanna spend money if this is not the problem. Is there anyone experienced enough to tell me what they reckon it is. BTW its a 2.0 hdi engine.