My wife has a c-max 1.6 tdci. Sounds like same probelm we had. It was down to injector seals. Ford dealer admitted its a common problem. Our fist one started at around 65k. Got the job done by dealer. They changed the seals and injector for the one injector as it was ford recommendation and gve me a bill of £ 648. At 68k, the injector next to it started showing the same probelm. Trip down to ford, same story, get booked for diagnostics was the advise.

I had enough, so i took the car down to a Bosch Garage. There are plenty of them around, just check Bosch's website. They replaced the replaced the seals on the remaining three. Seals from Ford cost me £21. Labour £140. And looks fine now!

Absolute rip off!! Wrote a complaint to the dealer. Got a reply yesterday. They apparently did it in my best interest ..

My suggestion would be if you are still under warranty, demand that you get all four injectors done. The next two is only round the corner. If not run away from Ford..

Advise from anyone within Ford would be really apprciated..