Autobar Festoon Bulb - 21W - BT239
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wilkoAutobar BT239 Festoon Bulb - 21w - Interior & Number Plate Light Replacement
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Product Information
Full details
The Autobar Festoon Bulb (BT239) is an essential maintenance component designed for vehicle owners who need a reliable, high-wattage replacement for interior cabin and number plate lighting. These 21W bulbs ensure your vehicle meets road-legal lighting standards and maintains proper cabin visibility, though users must verify their specific socket size and voltage requirements before purchase to ensure compatibility.
All features
| Model Part Number | BT239 |
|---|---|
| Brand | Autobar |
Extended Product Information
FAQs
Are these bulbs compatible with all vehicles?
No, they are compatible with vehicles that specify a 21W festoon bulb; always check your manual.
Can I use these for headlights?
No, these are strictly designed for interior cabin lights and number plate illumination.
Do I need any special tools to install them?
Generally, you only need a small screwdriver to pop off the light lens cover.
Does it matter which way the bulb is inserted?
Standard incandescent festoon bulbs are non-polarized, meaning orientation does not matter.
How many bulbs come in a package?
The BT239 is sold as a convenient twin-pack containing two bulbs.
Troubleshooting
Bulb does not illuminate after installation
Ensure the bulb is fully seated in the metal clips and verify that the vehicle light switch is turned on.
Light flickers intermittently
Check the metal contact clips for corrosion and gently bend them inward to ensure a tighter connection.
Bulb blows immediately upon activation
Verify that your vehicle's electrical system requires a 21W bulb and check for a short circuit in the housing wiring.
Pros and Cons
Pros
- Reliable and consistent light output
- Essential for passing MOT compliance
- Convenient two-pack packaging
- Easy to install in standard festoon sockets
Cons
- Not suitable for LED-specific lighting systems
- High wattage may not be compatible with all dimmer circuits
- Must verify length of existing bulb before installation
Setup, Compatibility & Care
To install, ensure the vehicle's ignition is turned off and the light switch is in the 'off' position. Carefully remove the light housing lens or cover using the appropriate tool. Gently depress the spring-loaded metal contact to release the old bulb, then snap the Autobar BT239 into place. Always avoid touching the glass of the new bulb with bare fingers; use a clean cloth or glove to prevent oil transfer, which can cause premature failure. Always check your vehicle owner's manual to confirm that your specific model requires a 21W festoon bulb, as mixing wattage can potentially damage delicate plastic housing components or blow fuses.