I Googled it and found out that a constant (ie not blinking) Micra engine fault indicates a problem with the emissions control system.
I also found out that people have been driving with the light on for months without any problems, and that cars have even passed the MOT in this state. So I drove home!
The common consensus was that the light comes on because of a fault in the lambda sensors, or a stretched chain.
However, its not unusual for warning lights to lie and indicate a fault when there isn't one. Somebody suggested disconnecting the battery for 30 minutes and then reconnecting it. If the warning light comes on again permanently then take it to a garage and get the code diagnosed.
I'll try this at the weekend.
Last edited by: Chris S on Tue 2 Aug 11 at 21:26
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