Steer doesn't work

I got a Lego Racers RC Nitro Flash with the number 4589.
At a certain moment i turned the bottom thing.
Because it was not going straight, i tried turing it back but i
couldn't.
So i opened uo the car, and removed it.
This causing the steer wouldn't work anymore.
I opened it many more times, but i couldn't fix it.
Is this happened to anyone else, or does someone know how to fix this?
Please let me know.

Thanks
Megaempire