Up date. Fitted the new temp sensor.. Went out Sunday to a usual farm shop, no light on this time. (Sunday). Going home got caught in heavy stop start traffic, 10 mins or so then, eventually the spanner light did come on but engine kept running for 5 mins or so, then it did die when I was between traffic lights. (Before it would have not lasted more than 5 mins in those traffic conditions). Did my usual, pour water over the fuel pressure regulator area, used my OBD to clear codes, although there are not any. Light goes out, engine starts and all was good, and got home ok, even then traffic was still stop start. I cant understand, why pouring water over the regulator area can enable me to put the light out and start the engine, if I do not use water I can not clear the fault until I do use water... Something is heat sensitive I think, which is why I thought it was the regulator at one point, but changing it did not solve this issue. As coil pack is on top of the engine, water doesn't get on it so there is no cooling effect on to it so I am assuming it isn't a fault with the coil pack? Baffled.
Any ideas at all please?