Hi Andy,Unfortunately there could be a variety of rensoas why you have the lack of power, and you will need someone who has the necessary vehicle diagnostic equipment to plug into the OBD (on board diagnostic) port on the car to determine the exact cause of the problem. If you are within striking distance of Loughborough we'd be happy to take a look at it for you, as we have all of the kit needed for this type of jobIf not, you really need to consult a garage specialising in diesels to ensure you get the correct diagnosisHope this helps
Walid - nqiOhGuIRLhEQoAm