1996 Volkswagen Golf Car wont start 1st time

Hi,

I drive a 2.0 mk5 golf 2006, the engine management light has been on for some time now. When I first took it to my mechanic he stated it needed a new EGR valve but would be ok to drive without replacing I then took it back to my mechanic after 8months for a service, he then told me that I needed a new throttle body.

This past couple of weeks it hasn't been starting 1st time, if left for a couple of hours it starts eventually. When I try to start it, it flashes up saying STOP oil fluid too low. I have now took it to a spark who has advised it needs a new brain because it has been water damaged. When I asked if this would take off the management light he informed me no that is a different fault all together, i'm confused and would be grateful for some advise.