The IS 250 generally uses H11 halogen fog bulbs (12V, around 55W). This is the standard for most IS 250 models, though exact specifications can vary by year, market, and trim.
In practice, you’ll mostly encounter H11 halogen fog lights in the IS 250, especially on the XE20 generation (produced roughly 2005–2013). However, some markets or optional packages may introduce variations, so it’s wise to verify with your owner’s manual or by inspecting the bulb itself if you’re replacing it.
Standard fog light bulb type
The following describes the typical setup found on most IS 250 models, particularly the XE20 generation.
- Bulb type: H11 halogen (12V, approximately 55W) used in the fog light housings.
- Markets and trims: The vast majority of regions use H11; some regional packages or later facelifts could include different fog-light setups, but H11 remains the standard in most specifications.
- Replacement notes: When replacing, use an automotive-grade H11 bulb and ensure proper seating in the fog light housing.
In short, for the majority of IS 250 configurations, the fog lights are built around H11 halogen bulbs. Always verify the exact size for your specific car if you’re unsure.
How to verify the bulb size on your IS 250
To confirm the exact bulb size on your car, use these steps.
Quick verification steps
- Consult the owner’s manual or the service manual for the exact bulb specification for your trim and year.
- Open the fog light housing and remove the bulb to read the stamped base (e.g., H11).
- Check the existing bulb if accessible without disassembly; note the base type and wattage.
If you cannot identify the bulb size from the manual or bulb itself, contact a Lexus dealer or a qualified mechanic to confirm the correct bulb for your exact vehicle configuration.
Upgrade considerations
Some owners upgrade fog lighting with LED or HID options, but these require compatibility checks for fitment, beam pattern, and legality in your region.
Notes on upgrades
- LED fog bulbs: Often available in H11 size; ensure you choose a kit designed for fog light housings and compatibility with your vehicle’s CAN bus to avoid warning codes.
- HID fog lights: If your IS 250 originally used halogen fogs, HID conversion kits may be more complex and require proper ballast installation and housing fitment.
- Installation: Follow the manufacturer’s instructions and consider professional installation to avoid misalignment or glare that could affect safety.
Upgrade options can improve brightness and color temperature, but proceed with care to maintain beam pattern and road legality.
Summary
The IS 250 commonly uses H11 halogen fog bulbs as standard across most markets, especially in the XE20 generation. Always verify your vehicle’s exact bulb size via the owner’s manual or by inspecting the bulb itself, since variations can occur by year, market, or trim. Upgrades to LED or HID are possible but should be approached with attention to compatibility, safety, and legality.