I'm new to the forums and really hope someone can help. i have a 3 1/2 year old signum elegance 2.2 tdi and the car/spanner yellow light keeps coming on with a resulting loss of power. the car is out of warranty now (typical !) and our local friendly mechanic has run a fault test on it at no charge (what a nice man). The fault code that comes up is P0638 which he says will be something to do with the throttle etc. but as it is only an intermittant fault it will be difficult , and probably expensive, to trace exactly what the problem is. It is getting much more frequent tho and is getting to the point that it's a gamble if you'll make it to/from your destinatio.
has anyone else had similar problems? or know more specifically what might be causing this.
Very gratefull for any advice.