1. The most common location is on the firewall under the hood, near the passenger side strut tower.
2. Another possible location is on the B-pillar, just behind the front door on the driver's side.
3. It may also be found in the owner's manual, or on the vehicle's VIN sticker.
The paint code will be a three or four digit number, followed by a letter or two. For example, "B52G" or "499A".
Once you have the paint code, you can take it to a paint store to purchase the correct touch-up paint for your car.