This document summarizes research on diagnostic methods for the rear drive axle of passenger cars. It discusses both subjective and objective diagnostic techniques. Subjective diagnosis involves using a stethoscope and flowcharts to trace noises from the rear axle to potential issues. Objective diagnosis uses a vibration meter to measure vibration velocity, displacement, and acceleration at five points on a Mercedes 190's rear axle. Vibration readings were within ISO limits, and inspection after disassembly found no damage. The document evaluates diagnostic methods for quickly and accurately locating rear axle faults without removing the component.