A CV joint, or constant velocity joint, is a mechanical joint that allows for the transmission of power between two shafts that are not aligned. CV joints are commonly used in front-wheel drive vehicles, where they allow the wheels to turn while still transmitting power from the engine to the wheels. Over time, CV joints can wear out and need to be replaced. There are a few different ways to check for a bad CV joint, including:
Inspecting the CV joint boot for tears or damage. If the boot is torn, grease can leak out and dirt and water can get in, which can damage the CV joint.
Listening for clicking or popping noises when turning. This is a common sign of a worn CV joint.
Feeling for vibrations in the steering wheel or drivetrain. This can also be a sign of a worn CV joint.