For the 2009 Nissan Titan, the supplied fitment data lists a 9005 bulb for the high beam. No low-beam bulb is listed, so confirm the low-beam socket and headlight assembly before ordering a replacement. The fog lights use 899 bulbs.
Other useful exterior bulb sizes include 3457 for the front turn signals and parking lights, 3157R for the brake and tail lights, and 3156 for the rear turn signals. Reverse lights use 921, while the center stop light uses 912.
License plate and map lights may use either 168 or 917. Interior applications include DE3175 for the dome light, 906 for the door-mirror light, and 158 for the step and glove-box lights. The front side marker uses 194NA.