Hi Guys
I'm not a technical person so pls bear with me. I have an 02 punto 1.2 and after having the head gasket done a few years ago the engine light flashes just after 70mph, if I speed up it goes off then comes on again at 80mph. If I ease off it goes off shortly after decelerating below 70 mph. This happens on a run after about 10-15 mins at speed. Its been running like this for a while now and doesnt seem to affect the performance but I'm worried it may do some bigger damage.

I spoke with the garage and they say they cant find a fault on their diagnostic (its a bosch service centre not a franchised dealer) and say there is nothing to worry about. Any ideas?

Cheers