Fog light bulb sizes vary by vehicle, but the most common halogen bases are H11, H8/H9/H16, 9005, 9006, and 5202. Always verify with your owner’s manual or by inspecting the existing bulb to ensure a correct match.
Common fog light bulb bases
Automakers rely on several standard bulb bases for fog light sockets. The exact size and shape determine which replacements fit your housing. Below are the bases you’re most likely to encounter.
- H11 — One of the most widely used halogen fog bulbs across many makes and models; a typical choice for modern fog-light assemblies.
- H8, H9, H16 (family) — European and some Asian vehicles commonly use these; H8 is common on older European cars, H9 often for higher-performance fogs, and H16 is widely used on newer vehicles and many all-LED replacements start here.
- 9006 (HB4) — Popular in many SUVs and trucks for fog lights; a common retrofit base in North America.
- 9005 (HB3) — Used in a subset of models, especially some European-market cars with fog light fixtures.
- 5202 (HB1) — Less common, found on certain GM and Chrysler models’ fog light circuits.
- H3 — A niche base used in some compact fog-light assemblies and aftermarket kits.
Note: There are other sizes in use, and some vehicles use integrated LED fog-light modules rather than replaceable halogen bulbs. Always verify the exact size for your vehicle.
Determining the exact bulb size for your car
To shop with confidence, confirm the precise bulb size before buying. Here's how to determine the exact size for your vehicle.
- Consult the owner’s manual or the in-vehicle bulb chart printed on or near the fuse box or the fog light housing.
- Inspect the existing bulb and socket: remove the fog light cover and read the base type stamped on the base.
- Use your vehicle’s year, make, and model in an online bulb finder or parts lookup tool from a reputable retailer.
- Take a photo of the current bulb and socket to show a parts specialist if you shop in a store.
- Consider the wattage and beam pattern you want when upgrading (halogen vs LED); some sockets support only certain types.
After ensuring the exact size, you’re ready to replace or upgrade. If you’re unsure, a professional installer can verify compatibility and ensure the fog lights are aimed correctly for safe night driving.
LED fog lights and compatibility
LED fog lights often come in dedicated assemblies or as LED replacements designed for specific bulb bases. While LED kits can be sized to fit primary bases such as H11 or 9006, compatibility with housing and electrical systems remains important.
Important considerations for LED upgrades
LED replacements may require CAN-bus adapters, heat management, and proper beam pattern to avoid glare or failure. Always check the product’s listed base type and the vehicle fitment notes.
In most cases, sticking to the original bulb size or using a purpose-built LED fog light kit designed for your model yields the best results.
Summary
Fog light bulb sizing is not universal and varies by vehicle. The most common bases you’ll encounter include H11, H8/H9/H16, 9005, 9006, and 5202, with occasional H3 or other sizes on older or niche models. Always verify with your owner’s manual, the existing bulb, or a trusted parts supplier, and consider professional help for installation and aim to ensure optimal fog light performance and safety.