How reliable is a Ford Sierra?

Ford Sierra's have a extremely good reliability rating of 800/999. The score was a mathematical result of the average score of every Ford Sierra that has had a registered MOT. Ford Sierra's reliability reviews are reflected in the score.

We calculated all of the below figures by getting the score from each vehicle make/model/year/fuel, which are each calculated a score. We then generate the average score from those, taking into account factors such as mileage and emissions.

You should always consider breakdown cover if you are concerned over the reliability of a vehicle.