My lady has just come home and told me that the red light on the dash of her Focus C-Max (I think it is the immobiliser light) was flashing when she was driving it home. The light usually stops flashing when you open the car on the key fob or if using the spare place it in the ignition. The alarm hasn't gone off at all and it only flashed when she was driving, when she came to a stop at traffic lights she thinks it stopped.

Any ideas people?

Many thanks

Dave