What is the low beam headlight bulb size for a 2017 Mercedes-Benz CLS400?

The 2017 Mercedes-Benz CLS400 uses a N/A bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 2017 Mercedes-Benz CLS400?

The high beam bulb size for the 2017 Mercedes-Benz CLS400 is N/A.

Why are my 2017 Mercedes-Benz CLS400 headlights dim?

Dim headlights on a 2017 Mercedes-Benz CLS400 can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a N/A LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2017 Mercedes-Benz CLS400 fog light?

The 2017 Mercedes-Benz CLS400 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 2017 Mercedes-Benz CLS400 single or dual beam?

The 2017 Mercedes-Benz CLS400 uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 2017 Mercedes-Benz CLS400?

Yes, the 2017 Mercedes-Benz CLS400 comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a N/A LED conversion kit for the low beams.

Did the 2017 Mercedes-Benz CLS400 change headlight bulb sizes from the previous year?

No — the 2017 Mercedes-Benz CLS400 uses the same bulb sizes as the 2016 model. This configuration has been consistent across the 2015–2018 generation.

How do I change the headlight on a 2017 Mercedes-Benz CLS400?

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 N/A 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 2017 Mercedes-Benz CLS400?

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 N/A 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 2017 Mercedes-Benz CLS400 headlights?

A pair of halogen N/A 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 2017 Mercedes-Benz CLS400?

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 N/A 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 2017 Mercedes-Benz CLS400 shares its bulb sizes with the 2015–2018 generation.

Fitment Guaranteed for 2017 Mercedes-Benz CLS400

What Size Bulbs Does a 2017 Mercedes-Benz CLS400 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 2017 Mercedes-Benz CLS400 Have?

Lighting on the 2017 Mercedes-Benz CLS400 is managed by a total of 3 bulbs, covering everything from primary headlights to signal indicators. It features a standard lighting system powered by a dual-bulb halogen configuration using separate low beam and high beam bulbs for precise light distribution. This model belongs to the mid years of the CLS400's 2015-2018 production span. 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 2017 Mercedes-Benz CLS400?

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 low beams, as they see the most use. Adding a matching 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.

2017 Mercedes-Benz CLS400 Bulb Size Chart

Position	Bulb Size	Shop
Side Marker	W5W	Buy W5W →
Reverse Light	921	Buy 921 →
Trunk Light	W5W	Buy W5W →

How do the 2017 Mercedes-Benz CLS400's bulbs compare to other years?

The 2017 Mercedes-Benz CLS400 uses the same bulbs as the 2016 model.

The 2018 model continues with the same bulb sizes.

This bulb configuration covers the 2015–2018 model years. ← 2016 2018 →

Finding the best installation guide...

Other CLS400 Years

2018 2016 2015

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