What is the low beam headlight bulb size for a 2018 Mercedes-Benz CLA45 AMG?

The 2018 Mercedes-Benz CLA45 AMG uses a H7 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 Mercedes-Benz CLA45 AMG?

The high beam bulb size for the 2018 Mercedes-Benz CLA45 AMG is H15.

Why are my 2018 Mercedes-Benz CLA45 AMG headlights dim?

Dim headlights on a 2018 Mercedes-Benz CLA45 AMG can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a H7 LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2018 Mercedes-Benz CLA45 AMG fog light?

The 2018 Mercedes-Benz CLA45 AMG typically does not come with factory fog lights in all trim levels. If your vehicle is equipped with them, check the manual as sizes can vary by trim.

Is the 2018 Mercedes-Benz CLA45 AMG single or dual beam?

The 2018 Mercedes-Benz CLA45 AMG uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 2018 Mercedes-Benz CLA45 AMG?

Yes, the 2018 Mercedes-Benz CLA45 AMG comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H7 LED conversion kit for the low beams.

Did the 2018 Mercedes-Benz CLA45 AMG change headlight bulb sizes from the previous year?

Yes — the 2018 Mercedes-Benz CLA45 AMG uses different bulb sizes than the 2017 model. The 2018 generation introduced this bulb configuration.

Is the 2018 Mercedes-Benz CLA45 AMG the first or last year to use H7 bulbs?

The 2018 Mercedes-Benz CLA45 AMG is the only year in the 2018 generation to use the H7 bulb for the low beam headlight.

How do I change the headlight on a 2018 Mercedes-Benz CLA45 AMG?

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 H7 bulb counter-clockwise to remove it, then insert the new bulb and reassemble. Note: Mercedes-Benz 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 Mercedes-Benz CLA45 AMG?

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 H7 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 Mercedes-Benz CLA45 AMG headlights?

A pair of halogen H7 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 Mercedes-Benz CLA45 AMG?

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 H7 position are available as direct plug-and-play replacements. Since the Mercedes-Benz uses CANbus monitoring, choose a CANbus-compatible LED kit to avoid dashboard errors.

The 2018 Mercedes-Benz CLA45 AMG has a unique bulb configuration not shared with adjacent model years.

Fitment Guaranteed for 2018 Mercedes-Benz CLA45 AMG

What Size Bulbs Does a 2018 Mercedes-Benz CLA45 AMG 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 Mercedes-Benz CLA45 AMG Have?

Owners of the 2018 Mercedes-Benz CLA45 AMG will find a total of 11 lighting elements throughout the vehicle's exterior. It features an extensive lighting system powered by a dual-bulb halogen configuration using separate H7 low beam and H15 high beam bulbs for precise light distribution. Note that Mercedes-Benz 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 Mercedes-Benz CLA45 AMG?

Upgrading to LED is one of the most effective ways to modernize your Mercedes-Benz's appearance and safety profile. We recommend starting your upgrade with the H7 low beams, as they see the most use. Adding a matching H15 LED kit later will complete the look and ensure consistent lighting performance. Because Mercedes-Benz 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.

2018 Mercedes-Benz CLA45 AMG Bulb Size Chart

Position	Bulb Size	Shop
Turn Signal Front	3457NA	Buy 3457NA →
Daytime Running	H15	Buy H15 →
High Beam	H15	Buy H15 →
Low Beam	H7	Buy H7 →
Turn Signal Rear	7507	Buy 7507 →
Parking Light	3457NA	Buy 3457NA →
Reverse Light	921	Buy 921 →
Brake Light	921	Buy 921 →
Door Light	W5W	Buy W5W →
Map Light	W5W	Buy W5W →
Trunk Light	W5W	Buy W5W →