Yesterday, I took my TL into Firestone to have the tires balanced and rotated (lifetime balance and rotation for $55). While driving the car today, I noticed the car is pulling slightly to the left. Should I take it back to have them inspect or rebalance? Or, is this a alignment issue? I didn't have this problem prior to this.

 

If it did not pull prior to having the tires rotated then its a tire problem...... I would find out how they rotated them. I.E. Straight front to back or an X pattern from front to back. Many times changing the rotational direction of a tire will cause issues like yours. Many times a tire will just have a "belt" issue that results in a "pull". You wouldn't notice it on the rear, but after a rotation......

Take it to the dealer and let them figure it out on their dollar... IE warranty.

 

What Do You Mean By A Belt Issue? Does That Mean I've Got A Problem With The Tires. My Tires Are Michelin Pilot Sport As.

 

Rotate the front tires left to right. If it pulls in the other direction, one of the two front tires has a "pull". Now rotate one from front to rear until you determine which tire it is that is causing the pull.

If you rotate the front tires left to right and it still pulls in the same direction as it did before, it's an alignment issue. Have you hit any potholes lately (how can you avoid them, right?).