I have not used my car for 3 weeks, it was flat so jump started drove out my drive and the engine light cam on?

The battery was completly flat but restarted straight away and the light did not come on until I drove about 50 yards down the road?

Can i reset it somehow? (scoobynet search is broke at the moment)

 

you can start and turn the car off 4 times and the light should go out, if the light comes back on after that then you should get the code read.

 

Did you 'jump' start it like you say ie with leads etc or did you 'bump' start it? Bump starting can damage the cat. I know you have written 'jump' but just thought i'd clarify.

 

Scooby Soon! Not sure where you are but if your in Lincs I have a Scangauge that can plug in and read the code.