For the 2002 Toyota 4Runner, both the low-beam and high-beam headlights use a 9003 bulb. The supplied fitment data does not identify a separate projector or non-projector headlight variation, so verify the original bulb before ordering.
Front fog lights may use either an H3 or H3C bulb, making the existing bulb important to compare. The front turn signals use 7440 bulbs, while rear turn signals use amber 7440A bulbs. Brake and tail lights use red 7443R bulbs, and the reverse light and center stop light use 921 bulbs.
Several smaller applications have alternate fitments. License plate, parking, and front side-marker lights may use either 2825 or 98 bulbs. Interior applications include DE3175 for the courtesy, dome, and trunk lights, 2721 for the glove-box light, and 57 for the map light. Instrument lighting requires comparison with the original bulb: listed options are 158, 194, 7441, and 2721, depending on the application.