You say tires, plural, both wearing on the inside? Then both have camber problems, not just the left.
Unfortunatly, unlike the rear, the front cannot be easily manipulated as far as stock goes. There is a caveman way to check how bad your camber is, and thats to put your car on level ground, and put an angle finder on a flat spot of the rim (not a protractor)(not the tire). This will only be as precise to half a degree. Computerized can down to like .02 or sum thing. You can look visually and see if the top part of the wheel is leaning in, if it does, thats cambered, and causing your tire wear. Idk how to adjust stock control arms (camber arms) but maybe someone can chime in
Btw, are you lowered at all? How much is the car driven?
Edit: ^^^^isnt inside tire wear caused from camber?
Sent from my DC4