What Size Bulbs Does a 2018 Ford Focus Use?
Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.
Installation Difficulty
Moderate (Dust covers often present)
Est. Replacement Cost
$50 - $150 (HID System)
What Lighting System Does the 2018 Ford Focus Have?
The 2018 Ford Focus features an extensive lighting system with 13 bulb positions. It uses factory HID/Xenon technology with D3S projector headlights. The Focus has been available from 2000 to 2018, and the 2018 model falls in the late-generation years.
Can You Put LED Bulbs in a 2018 Ford Focus?
The 2018 Ford Focus comes equipped with factory D3S 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 D3S 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 2018 Ford Focus
To remove the headlight bulb, disconnect the wiring harness, then twist the bulb counter-clockwise and pull it straight out of the housing. On the 2018 Focus, you will likely encounter rubber dust covers behind the headlight housing. These pull off by hand or unscrew depending on the design. Allow about 15 to 20 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 D3S 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
2018 Ford Focus Complete Bulb Size Chart
| Position | Bulb Size | Shop |
|---|---|---|
Low Beam | HID-D3S LED | Buy HID-D3S LED |
High Beam | HID-D3S LED | Buy HID-D3S LED |
Fog Light | H8 LED | Buy H8 LED |
Brake Light | LED Bulb | Buy LED Bulb |
Side Marker | 194 LED | Buy 194 LED |
Turn Signal Front | 12496 LED | Buy 12496 LED |
Turn Signal Rear | 3157K LED | Buy 3157K LED |
Reverse Light | 921 | Buy 921 |
Dome Light | LED Bulb | Buy LED Bulb |
License Plate | LED Bulb | Buy LED Bulb |
Map Light | LED Bulb | Buy LED Bulb |
Parking Light | 193 | Buy 193 |
Trunk Light | LED Light | Buy LED Light |
Want to upgrade everything at once?
Shop Complete LED Kit for 2018 Ford FocusHow Long Do 2018 Ford Focus Headlight Bulbs Last?
HID/Xenon headlights on the 2018 Ford Focus 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 8 years old, the original bulbs on your Focus 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 Ford Focus?
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 Ford Focus Headlight FAQ
Did Ford Focus Bulb Sizes Change Over the Years?
Over its production run from 2000 to 2018, the Ford Focus has seen bulb size changes in the Low Beam, High Beam and Fog Light positions. The 2018 model uses the newer bulb specification introduced around 2015. 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 Focus Years
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Other Vehicles That Use HID-D3S LED Bulbs
These vehicles from other makes also use a HID-D3S LED low beam bulb: