If your vehicle is showing one corner of the car sits noticeably lower than the rest, here are the most likely causes and the parts you'll need to fix each one.
The simplest and most frequent reason a car leans to one side is a flat tire or a tire with significantly low air pressure.
Coil springs support the weight of the vehicle. Over time, they can fatigue, sag, or snap due to rust and stress, causing that corner to drop.
On vehicles equipped with air suspension, a leaking air bag, faulty solenoid, or bad ride height sensor will cause the affected corner to deflate and sag.
On trucks and older vehicles, the leaf springs in the rear can crack or flatten out from heavy payloads or metal fatigue.
If suspension work was recently done, installing a spring or strut assembly with the wrong spring rate or failing to seat the spring properly will cause an uneven ride height.
Hitting a deep pothole or curb can bend a control arm or strut mount, physically altering the suspension geometry and lowering that corner.