had same problem with injectors, its a known ford fault usually around 90k miles. RAC engineer that came to me said he didnt have the software to recode it so took it to a ford garage and they did it, also used another garage when it went again as they also had the ford software. I eventually went for a full set of injectors as, if 1 has gone the others might be not too far behind but you can keep on resetting them and get about 10k out of them each time before the glow plug light comes on again.
Hi thanks for reply, just got mondeo back today all fixed so he managed to do it for me only costing me £50. thanks for all your help