what reason would there be for my Engine Management Light to be constantly on, on my dash?
Could be loads of them literally
Best get yourself down to vauxhall for fault diagnostics
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Electrical fault finding also taken on
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Some problems cause the EML to come on and stay on, even after the fault has been fixed.
Temp fix would be to disconnect the battery for half an hour then go for a drive and see if it comes back on.
Either way, you will need to go get it checked out.
Air Flow Meter and I would say knowing what my car is like it's prob the crappy egr valve dependant on your cars age, the only way to be sure is to get it on a tech 2 or if you have a pre 2000 car flash the codes with a paperclip