How can you tell if the idler arm needs replacing?

You can tell if the idler arm needs replacing by checking for excessive play or movement in the steering system. If you notice a loose or wobbly steering feel, uneven tire wear, or a clunking noise when turning, these could be signs of a failing idler arm. Additionally, visually inspecting the idler arm for any signs of damage, such as rust or bending, can indicate it's time for a replacement. A professional alignment check can also help determine if the idler arm is contributing to steering issues.