Injection warning light?

I have a scenic 1.9 dci 06 which was fine for 10 months until it went in for a service,never run propely for more than two weeks since. So far egr valve some pipe that runs to the particulate filter and god knows what else I have asked for a list, now injection warning light and barely enough power to drive really had enough of this car any ideas someone please. will sell as soon as fixed came from a main dealer as well.