matt,

There aren't any codes to let you adjust the wheels seperately.
If your car used to run straighter and it's suddenly turning more to one side, maybe you have carpet fuzz or something stuck in the tires? You could try opening the car to check it out.

I would think you can adjust the steering trim on the controller
in the other direction to get the car to go straighter. But that's the only other thing I could think of. My Cox Beetle turns to the right really sharp, and when I adjust the trim, it's almost all the way to the 'L' to make the car go straight.

I hope you can get your car going straight with the trim!