Suspect the warning was triggered by the low coolant level.

Once the engine warms the coolant expands & covers the sensor again so no warning again until the engine cools.

You say the coolant pipe was replaced recently.

Sounds like they either didn't top it up properly after the work was completed or have left a slight leak.

Coolant leaks don't always show up until the engine is fully up to temperature.

Just called the dealer for an update. They are currently fitting a new throttle body,under warranty. Fingers crossed.

Spoke too soon!

Returning from work this evening,just joined a dual carriageway & engine seemed to splutter/mis-fire. Engine malfunction...Service,message appeared (!) symbol illuminated.

Drove on with light throttle & car then went into limp mode....a bit scary when you're doing 60 mph then suddenly decreases to 40mph,especially with rush hour traffic rearing up behind you & going up an an incline!

Left the dual carriageway & pulled over as soon as possible. Waited about 30 seconds before switching off,& left for about a minute before re-starting. Warning message displayed,but engine running fine for rest of the journey.

Car is booked back at my local Ford dealer next week. The technician who deals with diagnostics is on holiday???? No loan vehicles available until the following week,but fortunately I can use my daughters' car.

I've had this car for nearly a year & it's been a pleasure to drive,& fairly economical(36-46mpg). I hope that I don't end up having to get rid of it, if it's going to carry on being problematic.