Go to My Documents > Euro Truck Simulator 2 > Open Config.cfg with notepad, (Notepad++) or w/e program you prefer.
Once opened, add this too your config. uset r_steering_wheel "0" With quotes
Method 2: Difficulty Easy
Go to My Documents > Euro Truck Simulator 2 > Open Config.cfg with notepad, (Notepad++) or w/e program you prefer.
Once opened, Change uset g_developer "0" too uset g_developer "1" and uset g_console "0" too uset g_console "1"
Launch Euro Truck Simulator 2 and open up console by pressing ''` ''
A console should pop up; in there type r_steering_wheel "0'' >>> the number ''0'' (zero) will disable the steering wheel, the number ''1'' (one) will enable the steering wheel.