If your 2016 Hyundai Sonata highway speeds, you can usually trace it to tires, wheels, or suspension. Use this step-by-step guide to track down the cause and decide what you can fix yourself.

If your 2018 Kia Sportage highway speeds, you can often narrow down the cause with a few simple checks at home. This guide walks you through the most common causes, what to inspect, and when it’s time to slow down and see a mechanic.