Relays are essential components in modern vehicles, playing a key role in controlling various electrical circuits. From powering lights and motors to activating sensors, relays manage electrical signals that control critical systems in a car. However, like any electrical component, relays are susceptible to failure. Understanding the different relay failure modes in cars is crucial for diagnosing electrical problems, maintaining vehicle performance, and preventing costly repairs. In this article, we will explore the most common relay failure modes, their symptoms, and how they can be addressed.