Your license-plate light bulb depends on the car — most vehicles use a wedge-style bulb (W5W/T10, often labeled 194 or 168) or a 31mm festoon bulb; newer models may use LEDs.
To help readers determine the exact bulb for their car, this guide covers common formats, how to identify yours, and practical upgrade options.
Common license plate bulb types
The following list covers the formats you are most likely to encounter when replacing a license-plate bulb.
12-volt, compact bulb with a wedge-shaped base that presses into the socket. Widely used for license plate lighting and other interior applications. Compatibility depends on base size and space around the socket.
A cylindrical tube with contacts at both ends, pressed into a small license-plate housing. Also typically 12V. Some models use longer or shorter festoon lengths, so check the exact size (31mm is common, but 36mm or other lengths exist).
Solid-state replacements that are brighter and longer lasting. Available as wedge or festoon shapes to match the original base. May require compatibility considerations with vehicle electronics (CAN bus) and resistors to avoid bulb-out warnings.
In practice, many cars still use one of these common formats, but there are exceptions based on make, model, and year. Always verify by checking the existing bulb or your vehicle’s manual.
How to identify the correct bulb for your vehicle
Use these steps to confirm the exact bulb type before purchasing a replacement.
- Consult the owner’s manual or the official parts catalog for your vehicle to find the recommended bulb size for the license-plate light.
- Remove the existing license-plate bulb and inspect the base or read any codes printed on the bulb itself (for wedge bulbs, you’ll see a base type; for festoon, note the length).
- Match the socket type and voltage (most cars use 12V bulbs). If the base is unclear, bring the old bulb to an auto parts store for a direct match.
- Check for any vehicle-specific notes, such as CAN bus compatibility or required resistors if you’re considering an LED replacement.
- Purchase a bulb with the same base and voltage, and confirm that the new bulb fits within the license-plate housing without touching hot surfaces or the mounting hardware.
Correct identification helps avoid returns and ensures the plate lights operate reliably without triggering warning messages.
Upgrading to LED or other options
If you’re seeking brighter or longer-lasting illumination, LED options are popular, but there are considerations to keep in mind.
(W5W/T10 LED equivalents):
Compact, low power consumption, and long life. Ensure the LED has the correct base and that the beam pattern suits the license plate area.
(31mm or other lengths):
Availability in various brightness levels. Verify length and polarity, and be aware of possible CAN bus issues on some vehicles.
:
Some owners opt for a small LED strip that runs along the license-plate housing. This approach may require careful mounting and a power/ground connection; check for clearance and waterproofing.
:
Some cars monitor bulb resistance; using LEDs without resistors can trigger warnings or hyper-flashing. If you install LEDs, you may need inline resistors or a CAN-bus-compatible LED kit.
LED upgrades can improve brightness and durability, but ensure compatibility with your vehicle’s electrical system to avoid warning lights or electrical noise.
Summary
The exact bulb for your license-plate light varies by vehicle, with wedge (W5W/T10, 194/168), festoon (31mm), and LED options being the most common. Identify the correct base and voltage by checking the owner's manual or the existing bulb, and consider LED replacements carefully to avoid electrical warnings. Whether you stick with a traditional bulb or go LED, proper fitment and electrical compatibility are key to reliable license-plate illumination.