The most common symptom of a bad tie rod is uneven tire wear.
If your tire is wearing unevenly or cupping then it could be caused by a bad tie rod which is causing a misalignment of your wheel.
A bad tie rod can also cause a steering wheel to shake as you drive down the road or even just a loose steering wheel as well as a squeaking noise when turning or when hitting bumps.
If your tie rod is going bad you need to get it replaced because if the tie rod breaks then you can lose steering and control of your vehicle which can be deadly at high speeds.