What causes the grinding noise when the car turns left?

[NoahMarie]

This situation is most likely caused by severe wear of the CV joint. Here is relevant information about automotive CV joints: 1. Overview: CV joints generally refer to constant velocity universal joints. They connect two shafts that have an angle between them or a change in relative position, enabling the two shafts to transmit power at the same angular velocity. Currently, the widely used constant velocity universal joints mainly include ball-type universal joints and cage-type universal joints. 2. Causes of damage: First, the CV joint boot has reached its service life, but the driver forgot to replace it during maintenance. Second, accidents or road debris damage the protective boot, causing irreversible effects on the working environment of the universal joint, which in turn causes the universal joint to lose its functionality, naturally leading to CV joint damage.