Adjustment method of vehicle direction deviation to the left: 1, kill the steering wheel of the vehicle to the right and expose the rear part of the left front wheel; 2. Loosen the fastening nut with a wrench, and then rotate the left pull rod clockwise, which is the position of the pull rod relative to the base of the pull rod; 3. Turn the steering wheel to the left and repeat the previous steps. The reasons for vehicle deviation are: 1 and uneven tire pressure, which is mainly caused by inconsistent driving tire pressure. Unequal tire pressure on the left and right sides will cause changes in the degree of friction between the tire and the ground, so only consistent tire pressure can ensure the most basic requirement of direction deviation; 2. The tire patterns on both sides are different or the patterns are different in depth; 3. The steering system will also affect the straight driving of the car. Due to the excessive wear clearance or the wear of bearings, kingpins and bushings, all connectors are loose, which will lead to the car's head shaking during driving and unable to maintain the normal trajectory. 4. The front shock absorber failed.