What Size Bulbs Does a 2018 BMW M240i Use?
Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.
Installation Difficulty
Hard (Tight clearances)
Est. Replacement Cost
$15 - $40 (Halogen) / $30+ (LED)
What Lighting System Does the 2018 BMW M240i Have?
The 2018 BMW M240i features an extensive lighting system with 12 bulb positions. It uses halogen technology with H7 LED low beams and H15 LED high beams in a dual-bulb configuration. The M240i has been available from 2017 to 2019, and the 2018 model falls in the mid-generation years. As a BMW vehicle, it uses a CANbus electrical system that monitors bulb status.
LED Flicker Warning
This vehicle (BMW) is known to use a CANbus system that checks for burnt-out bulbs. Installing standard LEDs may cause them to flicker or trigger a dashboard error.
We highly recommend using a CANbus decoder or "Anti-Flicker" resistors.
Can You Put LED Bulbs in a 2018 BMW M240i?
To upgrade the 2018 BMW M240i headlights to LED, you will need a H7 LED LED kit for the low beams and a H15 LED LED kit for the high beams. Start with the low beams since they are used most often and have the biggest impact on nighttime visibility. Important: BMW vehicles use a CANbus system that detects bulb wattage. Standard LED bulbs may trigger dashboard warnings or flicker. Choose LED kits labeled "CANbus-compatible" or add inline decoder resistors to prevent these issues. For the fog lights, a H8 LED LED bulb provides a clean white output that pairs well with LED headlights.
How to Replace Bulbs on a 2018 BMW M240i
The H7 bulb uses a spring clip or wire retainer that holds the bulb in the socket. To remove the old bulb, disconnect the wiring harness first, then twist the bulb counter-clockwise and pull it out. BMW vehicles are known for tight engine bay clearances around the headlight assembly. You may need to remove the air intake duct, battery cover, or wheel well liner to access the bulbs. Budget 30 to 45 minutes per side for your first replacement. When installing the new bulb, avoid touching the glass with bare fingers. Skin oils create hot spots that shorten bulb life. Wear clean gloves or handle the bulb by its plastic base only. 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 12 Positions at Once
2018 BMW M240i Complete Bulb Size Chart
| Position | Bulb Size | Shop |
|---|---|---|
Low Beam | H7 LED | Buy H7 LED |
High Beam | H15 LED | Buy H15 LED |
Fog Light | H8 LED | Buy H8 LED |
Brake Light | LED Bulb | Buy LED Bulb |
Turn Signal Front | 12496 LED | Buy 12496 LED |
Turn Signal Rear | 7506 LED | Buy 7506 LED |
Dome Light | 2825 | Buy 2825 |
License Plate | LED Bulb | Buy LED Bulb |
Map Light | 2825 | Buy 2825 |
Parking Light | 64132 | Buy 64132 |
Reverse Light | 7506 | Buy 7506 |
Trunk Light | 6418 | Buy 6418 |
Want to upgrade everything at once?
Shop Complete LED Kit for 2018 BMW M240iHow Long Do 2018 BMW M240i Headlight Bulbs Last?
Standard halogen headlights on the 2018 BMW M240i have an expected lifespan of 500 to 1,000 hours, which works out to roughly 2 to 3 years of normal use. Signs of a failing halogen bulb include noticeably dimmer output, a yellowish tint compared to the other headlight, or intermittent flickering. At 8 years old, the original bulbs on your M240i 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 2018 BMW M240i?
The H7 low beam bulb on the 2018 BMW M240i is a specific fitment. There are no widely recognized cross-compatible alternatives, so make sure to purchase the exact H7 size. 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.
2018 BMW M240i Headlight FAQ
Did BMW M240i Bulb Sizes Change Over the Years?
Over its production run from 2017 to 2019, the BMW M240i has seen bulb size changes in the Low Beam, High Beam and Turn Signal Front positions. The 2018 model uses the newer bulb specification introduced around 2018. Always verify the exact bulb size for your specific 2018 model year using the chart above, as using the wrong size can result in poor fitment or reduced light output.
Other M240i Years
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Other Vehicles That Use H7 LED Bulbs
These vehicles from other makes also use a H7 LED low beam bulb: