Hi can u help me please i have a vauxhal vectra 2.0dti 04 reg at high revs, over 3000 the engine management light comes on and the power is reduced, if I turn the ignition off it resets while driving and it goes off. if you have any idea what it could be would be great help. thanks

Trev, September 2010

A fault code reader may reveal the problem, but a common cause for this, is often the egr valve that needs cleaning regularly on these.

jim, September 2010