it did not want to start after a few times the light came on on the dashboard the one with the little red engine symbol on it.
Could be anything, - or at least many different things. And the best way to find out is obviously to call in the Renault folks, or rather their Diaglogys software... The fault
will be recorded in the computer.
I don't think the EGR could cause this. But if they had your car in their hands, maybe they pushed some wires around by accident ?
I have had two faults on my 2002 2.2dci (also a "The Race") - the one was the TDC sensor, and the other was the wires from the turbo-pressure sensor which had been cut by the aircon-compressor belt. The wires had somehow fallen down onto the belt, and slowly, they were worn through.
I don't think my TDC problem gave the "engine" symbol, but rather the "electronic" symbol (the zigzag pictogram) - so this hint may be way off, but it can do no harm to check its connection.
The TDC sensor at the bottom of the flywheel, and you can get to it from under the car. I have attached a picture, where I have circled out the TDC sensor itself. It is "clipped" onto the angine, and must touch the flywheel (!) - and the connector is apparently not up to the job. On the picture, I had the connector taken apart, as you can see from the dangling connector :-)