What is the most likely cause of a vehicle setting low on one front corner?

A vehicle setting low on one front corner is most likely attributed to a weak spring. The suspension spring is responsible for supporting the vehicle's weight and maintaining proper ride height. If a spring becomes weak, it can lose its ability to hold up the vehicle, resulting in a noticeable sag on one side.

When a spring is compromised, it cannot adequately support the load it was designed for, causing the affected corner to drop lower than the others. This situation can lead to uneven tire wear, poor handling, and potential issues with wheel alignment.

In contrast, while weak shocks, bent control arms, or bent steering knuckles can affect ride quality and handling, they typically do not cause a vehicle to sit lower on one corner by themselves. Weak shocks primarily affect the damping ability of the suspension but do not support the vehicle's weight directly. Bent components may alter alignment but would not typically lead to a sagging appearance unless they resulted in a failure of a spring.