Tie Rods facilitate steering the tires whenever you want to change lanes or directions of the car. So, when they get worn out, you face:

• Difficult steering of the vehicle because of stiff steering 
• Squealing or strange sounds when you try to turn the directions
• Misalignment in the front and back end of the car
• Absence of smoothness in the driving, especially while steering

The average lifespan of the tie rods can be as long as your car. All you need to do is get them checked and serviced at regular intervals. But if you need to change them, make sure you check both the tie rods. It is because, usually, both become worn-out at about the same time.