engine management light

So I've got my car back from the bodyshop with all the damage to the front repaired. Now my EML comes on about 10 times in a 5 mile drive to town for about 30secs a time. Don't think it's to do with the crash as it did it before just not so much. For what reasons would the EML come on...

I'd like to be more specific in the title but it's hard! I bought a 1.4i R-reg Astra about 2 months ago and there's a few problems. The first noticeable problem was a headlight out, so I bought a new bulb and changed it (which was bloody difficult thanks to that air filter!). This didn't...