What Size Bulbs Does a 2015 Infiniti Q40 Use?
Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.
Installation Difficulty
Easy (Plug and Play)
Est. Replacement Cost
$50 - $150 (HID System)
What Lighting System Does the 2015 Infiniti Q40 Have?
The 2015 Infiniti Q40 features an extensive lighting system with 13 bulb positions. It uses factory HID/Xenon technology with D2S projector headlights.
Can You Put LED Bulbs in a 2015 Infiniti Q40?
The 2015 Infiniti Q40 comes equipped with factory D2S HID/Xenon headlights. These already produce significantly more light than halogen bulbs, so upgrading is generally unnecessary. When your HID bulbs burn out, replace them with OEM-spec D2S HID bulbs to maintain the correct color temperature and beam pattern. Avoid cheap aftermarket HID bulbs as they can produce incorrect beam patterns and blind oncoming drivers. Your fog lights use a H8 LED halogen bulb, which can be upgraded to LED for a whiter color match with your HID headlights.
How to Replace Bulbs on a 2015 Infiniti Q40
To remove the headlight bulb, disconnect the wiring harness, then twist the bulb counter-clockwise and pull it straight out of the housing. Older model years like the 2015 Q40 typically offer easy access to the headlight bulbs from behind the headlight assembly under the hood. Most owners can complete the swap in under 10 minutes per side. HID headlights operate at high voltage. Always disconnect the battery before working on the headlight assembly. Never touch the HID ballast while the headlights are on, and handle the D2S capsule with gloves to avoid oil contamination. The fog lights are accessed from underneath the front bumper. You may need to remove a few plastic clips or screws from the fender liner to reach the H8 LED fog light socket.
Full Upgrade Bundle
Upgrade All 13 Positions at Once
2015 Infiniti Q40 Complete Bulb Size Chart
| Position | Bulb Size | Shop |
|---|---|---|
Low Beam | HID-D2S LED | Buy HID-D2S LED |
High Beam | HID-D2S LED | Buy HID-D2S LED |
Fog Light | H8 LED | Buy H8 LED |
Brake Light | LED Bulb | Buy LED Bulb |
Side Marker | 2827 LED | Buy 2827 LED |
Turn Signal Front | 7444NA LED | Buy 7444NA LED |
Turn Signal Rear | 7440 LED | Buy 7440 LED |
Dome Light | 175 | Buy 175 |
License Plate | 168 | Buy 168 |
Map Light | 175 | Buy 175 |
Parking Light | 7444NA | Buy 7444NA |
Reverse Light | 921 | Buy 921 |
Trunk Light | 158 | Buy 158 |
Want to upgrade everything at once?
Shop Complete LED Kit for 2015 Infiniti Q40How Long Do 2015 Infiniti Q40 Headlight Bulbs Last?
HID/Xenon headlights on the 2015 Infiniti Q40 typically last 2,000 to 3,000 hours, or about 4 to 6 years of regular driving. As HID bulbs age, they shift color toward pink or purple, which is a clear sign that replacement is needed. Flickering on startup also indicates a worn bulb or failing ballast. At 11 years old, the original bulbs on your Q40 are likely overdue for replacement. Even if they still illuminate, reduced brightness significantly impacts nighttime safety. When one headlight burns out, replace both sides at the same time. Bulbs from the same batch age at similar rates, and mismatched brightness is distracting to oncoming drivers.
What Bulbs Are Compatible with the 2015 Infiniti Q40?
Using the wrong bulb size can cause improper beam patterns that reduce your visibility and blind other drivers. It can also cause overheating inside the headlight housing, potentially warping the plastic lens or reflector. Always verify the bulb number before purchasing.
2015 Infiniti Q40 Headlight FAQ
Did Infiniti Q40 Bulb Sizes Change Over the Years?
We currently have bulb data for the 2015 Infiniti Q40. Check back as we expand our database with additional model years and trim-level variations.
More from Infiniti
Other Vehicles That Use HID-D2S LED Bulbs
These vehicles from other makes also use a HID-D2S LED low beam bulb: