Why does the Audi A3 make a clunking sound when starting?

[EmersynLynn]

When the car starts, the clunking sound may be due to clutch failure, transmission failure, lower arm failure, or inner CV joint wear. The methods for identifying car sounds are as follows: 1. Normal sounds: Normal vibration sounds from various system components (such as noise from the engine surface), gear impact sounds during shifting, intake and exhaust sounds from gas-operated sources, gear meshing noise, etc., all fall under normal sounds. 2. Abnormal sounds: Abnormal sounds (or noises) can be categorized into minor noises, general noises, and severe noises based on their impact on car performance. Minor noises, such as sparking sounds from high-voltage electricity leakage or slight looseness in rolling bearings, generally have low volume and do not significantly affect component wear, showing no significant changes over a long period. Such faults can still allow the car to operate normally without immediate repair.