For the 2001 Nissan Maxima, both the low-beam and high-beam headlights use a 9003 bulb. The supplied fitment data does not indicate a separate bulb for different headlight types, so verify the original bulb before ordering if the housing has been replaced or modified.
Fog-light fitment is listed as either H3 or H3C; compare the existing bulb and socket to confirm which version your vehicle uses. The front turn signals and parking lights use 1157A, while the front and rear side markers use 194NA.
At the rear, the brake and tail lights use 7443R, the center stop light uses 7440, and the reverse lights use 921. Rear turn-signal fitment is listed as 7507 or 1156A, so compare the original bulb before replacement. License-plate lighting may use 168 or 917. Interior and cargo applications include 161 for courtesy lighting, DE3175 for the dome light, and 158 for the trunk light.