HI.

I've got a 2007 1.4 TDCI Fiesta Diesel that i've owned since August 2009 with no trouble at all, but after service and its first MOT, it has developed a very rough idle, although driving is fine.

That is until last week when i was on the motorway and it diasplyed "Engine System Fault" with a flashing amber gear with a ! in the middle. I stopped and called out the breakdown service, the guy came out and started it, and revved it high three times. after that it was fine for a few days, when it went rough while idling again.

Its now in the local ford dealer where i bought it from, but they cant figure out what the problem is. they've had it for 3 days!

Does anybody have any ideas? i fear that this is going to cost me a fortune, although they did say after the second day they would only charge me for 1.5 hours, and i do have an extended warranty

Any help appreciated