A160 dashlights/Engine management light

[sleepinginsomnia]

Can anyone help with this problem?

I went to start my car up and the entire dashboard lit up and flashed. Looked like a christmas tree! Every light on the dashboard flashed.
The car didn't start and it sounded like the battery was flat/lack of fuel.

I disconnected the battery for 5 minutes and reconnected it and the car started with no problems.

However, now the engine management light is constantly on when the car is started.
The car runs fine and everything still works as normal.

Any ideas on what it could be? Or any idea on how to make the engine management light turn off?

Cheers!

Just to add some information as I have been searching through the forum.

I ran it low of fuel yesterday, so it could be I have just dragged some muck up through the engine.
Just hoping it isn't the Air Mass unit.