As an auto mechanic or DIYer, knowing the common car issues and how to diagnose them is essential for keeping your vehicle in top shape. Whether you're dealing with malfunctioning brakes, a check engine light that won't go away, or any other issue, this guide will help you quickly identify the problem and find the best solution. Plus, we'll provide tips on where to find high-quality replacement parts and performance upgrades to keep your car running smoothly.