I just put new wheels on my Z and the tcs slip and abs light stayed on. they are 18x8.5 in the front the tire size is 225/45/r18
And in the rear I have 18x9.5 and the tire size is 235/45/50 so Is the problem with the size of the tires or is it something els?

 

Your tires sizes are close enough to stock that they are not the problem.

Did you make any other changes, or do anything else?

I would try driving the car around for awhile. The lights may go out after doing this.

 

Yeah I lowered the car in the process its on bc racing coilovers but other than that nothing els was done?

 

If you lowered the car, all you need to do is drive it a few miles. The lights will go out.

 

Is there anything els down there I should double check just to make sure u didn't mess anything up?

 

I think you are OK.