My daughter has called to say her light is on. I am confident that all levels are fine and it is running smoothly - from Googling around it appears to mean some sort of emission equipment fault.
Is it true that disconnecting the battery for a few minutes will re-set the light? If it comes on again then we will take the car to the dealer - but would rather be sure before parting with cash.
(3 years old UK - MX5 1.6)