The exact bulb varies by vehicle, but common tail-light replacements are 194/168 wedge bulbs for tail/parking lights and 1156/1157 dual‑filament bulbs for brake and tail functions; many newer vehicles use LED assemblies instead of a traditional bulb.
How to identify the right bulb for your tail light
To determine the exact bulb number and base type for your tail light, start with these steps:
- Check your vehicle’s owner's manual or the door jamb sticker, which lists bulb numbers by location.
- Inspect the current bulb or the socket to read the base type (wedge vs. bayonet) and the part number printed on the bulb.
- If you’ve removed the bulb, note the base shape and number, then cross-check with the vehicle year/make/model online or at an auto parts store.
- Decide whether you need a traditional halogen bulb or a replacement that matches an LED-equipped housing, if applicable.
Following these steps helps ensure you buy the correct replacement for your tail light, avoiding fitment or electrical issues.
Common tail-light bulb types and bases
Different generations and manufacturers use different bulb families. Here are the most frequently encountered types and what they do.
- Wedge-base bulbs (example families include 194 and 168): common for tail and parking lights; they plug into a flat, wedge-shaped socket.
- Single-filament bayonet bulbs (example like 1156): typically used for tail or brake lights where a single brightness is required.
- Dual-filament bayonet bulbs (example like 1157): used where a single bulb must provide both tail/parking and brake functions, or tail and turn depending on the vehicle.
- Combination bulbs used in some models (including certain trucks and imports): may employ dual-filament configurations or different socket designs that require checking the manual or the existing bulb for exact fitment.
- LED replacements and modules: in many modern cars, the tail light is an LED assembly; if you’re upgrading, you may need to replace the entire housing or use LED bulbs specifically rated for the same socket and voltage, while considering CAN bus and heat management.
When in doubt, bring a known-good bulb to the parts counter or consult your vehicle’s file with the exact year, make, and model to confirm compatibility.
LED and newer assemblies
As vehicle lighting shifts toward LED technology, some tail lights are designed as complete LED assemblies rather than replaceable bulbs. If your car uses an integrated LED tail light, you typically replace the entire unit rather than a single bulb. If your goal is a brighter or longer-lasting option, look for LED replacements that match the original socket and electrical specifications and verify compatibility with your vehicle’s electrical system.
Replacement tips and safety
Before replacing a tail-light bulb, follow these practical guidelines to ensure safety and correct operation:
- Turn off the ignition and, if possible, disconnect the battery before handling the bulb or housing; bulbs can be hot and electrical circuits may be live.
- Wear gloves or use a clean cloth to avoid touching the glass with bare skin, since oils can shorten bulb life.
- Replace bulbs in pairs when feasible to ensure uniform brightness and color on both sides.
- Test the lights after installation and check for proper brightness, beam pattern, and immobilization of any moisture in the housing.
These practices help ensure a reliable tail-light performance and reduce the risk of early bulb failure.
Summary
Tail-light bulb selection is vehicle-specific. Identify the exact bulb number and base from your manual or the existing bulb, with common options including 194/168 wedge bulbs for tail/parking lights and 1156/1157 dual-filament bulbs for tail and brake functions. Many newer vehicles use LED tail lights, which may require full assemblies rather than replacement bulbs. Always verify compatibility before purchasing and follow proper safety procedures during replacement.