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This Bosch W21/5W bulb is designed for vehicle owners needing a reliable dual-filament 12V bulb with 21/5W power. Its primary benefit is providing dual-function lighting for applications like brake lights and tail lights in vehicles without integrated LED systems. A key consideration is its compatibility, which requires checking specific vehicle models and ensuring it's not used in systems designed for LED headlights or tail lights.
| Model Part Number | 1987302823 |
|---|---|
| Brand | Bosch |
The W21/5W bulb is typically used for dual-function lighting in vehicle tail light assemblies, serving as both the tail light (5W) and the brake light (21W).
No, this bulb is designed for vehicles that use standard halogen bulbs and are not equipped with factory-installed LED tail lights or headlights.
Check your vehicle's owner's manual or remove the existing bulb from the tail light assembly. Look for markings indicating 'W21/5W' or '12V 21/5W' and a 'W3x16q' base.
It means the bulb has two separate filaments. The lower wattage (5W) provides constant illumination (tail light), while the higher wattage (21W) activates for brighter light when braking.
W3x16q refers to the specific base type of the bulb. It ensures the bulb fits correctly and makes proper electrical contact within compatible light sockets.
The lifespan of a halogen bulb varies depending on usage and driving conditions, but this Bosch bulb is designed for reliable performance equivalent to original equipment standards.
Yes, in most vehicles, replacing a W21/5W bulb is a straightforward DIY task. Refer to your vehicle's manual for specific instructions on accessing the tail light assembly.
Check the bulb is correctly seated in the socket. Verify the vehicle's fuse for the tail/brake lights is intact. Ensure the vehicle's electrical system is functioning.
This indicates a faulty filament within the bulb. Replace the bulb with a new one. Ensure the socket contacts are clean and not corroded.
Check for loose connections at the bulb socket or in the wiring harness. Corrosion on socket contacts can also cause this; clean contacts gently with electrical contact cleaner.
Ensure you have the correct 21/5W bulb specification. The issue might be with vehicle wiring or a voltage regulator problem, which requires professional diagnosis.
Compatibility:
Before purchasing, verify that your vehicle's lighting system is designed for a W3x16q base and requires a 12V 21/5W dual-filament halogen bulb. This bulb is intended for vehicles *without* integrated LED tail lights or headlights. Consult your vehicle's owner's manual or check the existing bulb to confirm compatibility. Manufacturers compatible include VW, MERCEDES-BENZ, OPEL, FORD, RENAULT, SKODA, FIAT, SEAT, HYUNDAI, and PEUGEOT, but specific model year and equipment variations apply.
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