What are reasons your steering wheel won't lock?
I assume that you are referring to your steering wheel not locking in position after you stop the vehicle and take out the key?There are several possible reasons for this.1. The cog that fits into the detent on the steering column is broken and needs to be replaced.2. The detent on the steering column is worn or broken3. You have not turned the wheel far enough for the cog to find a detent. Pull the wheel first to the left, and then to the right to find the spot.4. The actuator from the solenoid to the cog is broken.To repair this will require the cover on the steering column to be removed, and probably need to have the steering wheel removed as well. Take it to a qualified shop or dealer for this. Incorrect actions could result in damage to the parts, or even the deployment of the air bag on the steering wheel. The exact disassembly required will differ for each manufacturer and possible model of vehicle. If you have a Chilton's manual for your vehicle, you can look up the repair to see what is involve.