Wear of automobile control arm will lead to the following problems:

1. Suspension system instability: The control arm is an important part of the suspension system, which is responsible for supporting the weight of the vehicle and connecting the wheels with the body. When the control arm is seriously worn, it will lead to the instability of the suspension system and affect the handling performance and stability of the vehicle.

2. Uneven tire wear: The wear of the control arm will change the contact angle between the wheel and the ground, resulting in uneven tire wear. This will lead to early tire wear, reduce the service life of tires, and increase the frequency and cost of tire replacement.

3. Tire deflection: Wear of the control arm will lead to wheel deflection or oscillation, which will cause the vehicle to run in an unstable direction and even deviate from the track. This will not only affect the driving safety, but also increase the fuel consumption of vehicles.

4. Vibration and noise: The wear of the control arm will increase the friction between the parts of the suspension system, resulting in vibration and noise. This not only affects driving comfort, but also may cover up other potential problems and increase maintenance costs and risks.

5. Suspension system failure: ignoring the wear of the control arm for a long time will lead to excessive wear of other parts of the suspension system, and even lead to suspension system failure. This will seriously affect the safety performance and driving stability of vehicles and increase the risk of accidents.

Therefore, timely inspection and replacement of the seriously worn control arm is an important measure to maintain the normal operation and driving safety of the vehicle suspension system. Avoiding the problems caused by the wear of the control arm is helpful to prolong the service life of the vehicle and improve the driving safety and comfort.