Here are some common symptoms of a bad axle in a car: 1. Clicking or popping sounds when turning: A worn or damaged axle may make clicking or popping sounds when you turn the steering wheel. 2. Vibration or shaking: If you feel a vibration or shaking sensation in the steering wheel or the car body while driving, it could be a sign of a bad axle. 3. Grease on the edge of the tire: If you notice grease on the edge of the tire, it could be because the axle boot has torn, and grease is leaking out.