Engine check light?

[BazMc EK4 S.i.R]

I was practiceing launchs in my yard last night(geting ready for japfest) and for the first 8 times its was grand.then on the next few times when i catch second and the wheel hops like always but the abs light comes on.this kept happening so then i took it for a spin up the road and banged down threw the gears when slowing down and the engine check light flashed on each time i droped a gear...i checked the car over today.thers no teres in my drive boots so no grease on the abs sensor and the only things i found wrong in the engine bay was that the oil dipstick was after coming up out of its hole and the battery connection had com off and was just rubbing of the battery terminal.Also if it makes a difference it was extremly wet last night.Any help much appreciated.

 

[RagingAngel]

probably the connection to the battery wasn't secure.