Assuming you have a warranty and copy thereof, your best bet is to read it. Warranties vary, and the current used car warranty is probably different than the current new car warranty.

On most new cars, all parts are covered except the tires, maybe the battery, especially if it is a purchased commercial item and not made by the car manufacturer, and usually "wear parts" like brake pads and clutch, or maintenance parts/fluids that should be replaced at periodic time or mileage intervals. Then there is the matter of "adjustments".

For example, the adjustment period for the new car warranty on my '88 was one year. Alignment is considered an "adjustment" since normal use/abuse can knock it out, so it's not covered by the full four years that covers the non-maintenance/non-wear parts.

Duke