How can you tell what side CV axle shaft is bad?

To determine which side CV axle shaft is bad, listen for clicking or popping noises when turning, especially during sharp turns; this often indicates a failing outer CV joint. Additionally, inspect for any visible damage or grease leakage around the CV boots. You can also check for vibrations during acceleration, which may suggest an issue with the axle. Testing each side individually by turning the vehicle can help isolate the problem.