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Tires

I would like to know why front drivers side tire tread depth is wore down and not the rest of my tires?

Here’s a diagram - which do yours resemble? Both sides? Front? Rear?

Because your car needs a front end alignment.

Seems like a jump to a diagnosis. The problem could be bad ball joint, control arm bushing (common in Saturns), blown strut or any number of other front end problems including merely a misalignment.

You should have your front end checked.

Thanks I will have it check!