What is the low beam headlight bulb size for a 2018 Audi Q3?

The 2018 Audi Q3 uses a HID-D5S LED bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 2018 Audi Q3?

The high beam bulb size for the 2018 Audi Q3 is HID-D5S LED.

Why are my 2018 Audi Q3 headlights dim?

Dim headlights on a 2018 Audi Q3 can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a HID-D5S LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2018 Audi Q3 fog light?

The 2018 Audi Q3 uses a 921 bulb for the fog light position.

Is the 2018 Audi Q3 single or dual beam?

The 2018 Audi Q3 uses a single bulb (dual filament) headlight system. This means one bulb controls both high and low beams.

Can I install LED bulbs on my 2018 Audi Q3?

Yes, the 2018 Audi Q3 comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a HID-D5S LED LED conversion kit for the low beams.

Does the 2018 Audi Q3 have fog lights?

Yes, the 2018 Audi Q3 takes a 921 bulb for the fog light position.

Did the 2018 Audi Q3 change headlight bulb sizes from the previous year?

No — the 2018 Audi Q3 uses the same bulb sizes as the 2017 model. This configuration has been consistent across the 2016–2018 generation.

Is the 2018 Audi Q3 the first or last year to use HID-D5S LED bulbs?

The 2018 Audi Q3 is the last year in the 2016–2018 generation to use the HID-D5S LED bulb for the low beam headlight.

How do I change the headlight on a 2018 Audi Q3?

Turn off the vehicle and open the hood. Locate the headlight assembly from behind, remove the dust cover or retaining clip, disconnect the wiring harness, twist the old HID-D5S LED bulb counter-clockwise to remove it, then insert the new bulb and reassemble. Note: Audi vehicles use a CANbus system, so LED replacements may need an anti-flicker decoder. The whole process typically takes 10 to 30 minutes per side depending on accessibility.

Are LED headlights legal for a 2018 Audi Q3?

LED bulbs used off-road or in auxiliary lights are legal everywhere. For on-road headlight use, legality varies by state. Many states allow LED retrofits as long as the beam pattern meets DOT standards. For the best legal compliance, choose a DOT-approved HID-D5S LED LED kit that is designed as a direct replacement and produces a proper cutoff pattern without excessive glare.

How much does it cost to replace 2018 Audi Q3 headlights?

A pair of halogen HID-D5S LED bulbs costs $15 to $40, while LED conversion kits run $25 to $60 per pair. If you have a shop do the work, expect an additional $20 to $50 in labor per bulb. Replacing them yourself at home saves the labor cost and usually takes under 30 minutes.

What is the difference between halogen and LED for a 2018 Audi Q3?

Halogen bulbs produce a warm yellow light (around 3200K), last 500 to 1000 hours, and draw more power. LED bulbs emit a brighter white light (5000-6000K), last 25,000+ hours, and use less energy. LED upgrades for the HID-D5S LED position are available as direct plug-and-play replacements. Since the Audi uses CANbus monitoring, choose a CANbus-compatible LED kit to avoid dashboard errors.

The 2018 Audi Q3 is the last model year to use this bulb configuration (2016–2018).

Fitment Guaranteed for 2018 Audi Q3

What Size Bulbs Does a 2018 Audi Q3 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 Audi Q3 Have?

Lighting on the 2018 Audi Q3 is managed by a total of 12 bulbs, covering everything from primary headlights to signal indicators. It features an extensive lighting system powered by a halogen-based setup where a single HID-D5S LED dual-filament bulb handles both low and high beam duties within the same reflector. This model belongs to the late years of the Q3's 2015-2019 production span. Note that Audi vehicles typically feature a CANbus electrical monitor that checks for specific bulb resistance.

LED Flicker Warning

This vehicle is known to use a CANbus system. Installing standard LEDs may cause flickering.

Use a CANbus decoder.

Can You Put LED Bulbs in a 2018 Audi Q3?

Upgrading to LED is one of the most effective ways to modernize your Audi's appearance and safety profile. Since your Q3 uses a single HID-D5S LED bulb for both high and low beams, ensure your chosen LED kit is "dual-beam" compatible. This allows the LED circuitry to mimic the two-filament design of the original halogen bulb. Because Audi utilizes a CANbus system, standard LED bulbs may cause "bulb out" errors on your dashboard. Always opt for "Error-Free" or CANbus-ready kits which include the necessary resistors. Don't forget the 921 fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

2018 Audi Q3 Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	HID-D5S LED	Buy HID-D5S LED →
High Beam	HID-D5S LED	Buy HID-D5S LED →
Fog Light	921	Buy 921 →
Brake Light	LED Bulb	Buy LED Bulb →
Side Marker	LED Bulb	Buy LED Bulb →
Turn Signal Front	12181NA	Buy 12181NA →
Map Light	2825	Buy 2825 →
Parking Light	LED Bulb	Buy LED Bulb →
Turn Signal Rear	LED Bulb	Buy LED Bulb →
Reverse Light	921	Buy 921 →
Trunk Light	2825	Buy 2825 →
Door Light	W5W	Buy W5W →

How do the 2018 Audi Q3's bulbs compare to other years?

The 2018 Audi Q3 uses the same bulbs as the 2017 model.

The 2019 model switched to a different bulb configuration.

This bulb configuration covers the 2016–2018 model years. ← 2017 2019 →

Finding the best installation guide...

Other Q3 Years

2019 2017 2016 2015

Other Vehicles That Use HID-D5S LED Bulbs

2019 Alfa Romeo 4C 2019 Alfa Romeo Giulia 2019 GMC Sierra 1500 Limited 2019 GMC Sierra 2500 2019 GMC Terrain 2018 Chevrolet Silverado