The 2014 Acura RDX does not have a single bulb size. The correct size depends on your car’s lighting configuration and trim level. In practice, many models use HID headlights with D3S bulbs, while halogen-equipped trims use conventional high- and low-beam sizes such as 9005 and 9006. Fog lights typically use H11, and other exterior lamps have their own standard sizes.
Headlights: HID versus halogen
Bulb sizes for the headlights depend on whether your RDX uses xenon/HID headlights or halogen projectors. Here are the most common configurations you’ll encounter.
- If equipped with factory HID headlights: D3S bulbs (some early-production units used D2S; verify by checking the existing bulb or owner's manual).
- If equipped with halogen headlights: high-beam bulbs are typically 9005, and low-beam bulbs are typically 9006.
Bulb sizes for headlights can vary by market and trim; always verify by inspecting the current bulb or the vehicle’s documentation.
Fog lights and other exterior lamps
Fog lights in most 2014 RDX models use a standard H11 bulb. Front turn signals and other rear lamps have their own sizes that often follow common wedge-base standards.
- Fog lights: H11
- Front turn signals: commonly 7440 or 7443 depending on the market and bulb type
- Rear combination lamps (brake/turn): commonly 3157 or 3057 family variants
- Backup lights: typically 921 wedge base
- License plate lights: often 194 or W5W equivalents
Because exact sizes can vary by trim and region, check the bulb you remove or consult the owner's manual for the precise specification.
How to confirm the exact bulb size for your car
To be sure you buy the correct bulb, use these steps. You can also reference the owner's manual or a dealer/service bulletin for your exact VIN and market.
- Locating the bulb: remove the cover in the headlight or underhood area and read the bulb label.
- Cross-checking: compare to the part numbers listed in the manual or on Acura’s parts site.
- When in doubt: take the old bulb to an auto parts store for an exact cross-reference.
If your RDX has HID headlights, replacing with halogen bulbs is not recommended; use the recommended HID replacement (D3S or D2S as applicable).
Where to buy and install bulbs
Replacement bulbs are widely available at auto parts retailers and Acura dealerships. If you’re replacing multiple bulbs (headlights, fogs, signals), consider buying a complete bulb kit that matches your trim’s configuration.
- OEM or genuine Acura bulbs for exact fit and color
- High-quality aftermarket bulbs with similar wattage ratings
- Do-it-yourself installation guides and videos for the 2014 RDX
For complex lighting changes or HID systems, professional installation is recommended to ensure proper alignment and safety.
Summary
The 2014 Acura RDX does not have a single bulb size. Headlights can be HID (D3S/D2S) or halogen (9005/9006) depending on the trim. Fog lights are usually H11, with turn signals and taillights following common automotive sizes such as 7440/7443 and 3157/194, respectively. Always verify the exact size by checking the current bulb, owner’s manual, or dealer documentation, since regional and trim differences can apply.