921 Bulb Replacement Guide

What cars use 921 bulbs?

Use the form below to see whether this bulb appears in fitment data for a specific vehicle.

Replacement options

Useful info about 921

921 bulb guide

921 is one of the most popular small automotive bulbs. You’ll often see it used for reverse/backup lights, trunk/cargo lights, and other utility positions. Because it’s used in multiple places across different vehicles, always confirm the exact position you’re replacing.

Why people upgrade 921 to LED

• Backup lights: a quality LED can improve rear visibility and camera clarity.
• Cargo/trunk: brighter, cleaner light makes the space easier to use.
• Lower power draw: helpful for interior lights that stay on for longer periods.

What to watch for

• Polarity: some LED versions only work one way. Flip it if it doesn’t light.
• Heat: high-output LEDs still need decent cooling.
• Color: neutral white often gives better contrast than very blue “cool white,” especially in rain or fog.

If you have recurring failures, inspect the socket for corrosion and check that the housing seal isn’t letting water in.

Cross Reference

921 is the same as: 158, 161, 168, 168NA, 175, 192, 193, 194, 194LL, 194NA, 194R, 2821, 2825, 2827, 558, 658, 904, 906, 906NA, 912, 916, 917, 921LL, 922, T12, t15, T8.