My 2005 Vauxhall Zafira 2.2 diesel has developed a slight loss in power in low rpm after it failed to start one morning. Diagnostic checks showed nothing , no engine lights or funny sounds when driving.

My local dealer has taken a look at it and say the chain tensioner has broken. They say I need a new engine, which will cost £6000. Dose this sound right to you?

The car is worse now after they have been working on it for those first three days. We have complained and are waiting to hear back Vauxhall regarding this situation, the car has done 76k.