What is the low beam headlight bulb size for a 2012 Mercedes-Benz CLS550?

The 2012 Mercedes-Benz CLS550 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 2012 Mercedes-Benz CLS550?

The high beam bulb size for the 2012 Mercedes-Benz CLS550 is N/A.

Why are my 2012 Mercedes-Benz CLS550 headlights dim?

Dim headlights on a 2012 Mercedes-Benz CLS550 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 2012 Mercedes-Benz CLS550 fog light?

The 2012 Mercedes-Benz CLS550 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 2012 Mercedes-Benz CLS550 single or dual beam?

The 2012 Mercedes-Benz CLS550 uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 2012 Mercedes-Benz CLS550?

Yes, the 2012 Mercedes-Benz CLS550 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 2012 Mercedes-Benz CLS550 change headlight bulb sizes from the previous year?

Yes — the 2012 Mercedes-Benz CLS550 uses different bulb sizes than the 2011 model. The 2012–2018 generation introduced this bulb configuration.

Is the 2012 Mercedes-Benz CLS550 the first or last year to use N/A bulbs?

The 2012 Mercedes-Benz CLS550 is the first year in the 2012–2018 generation to use the N/A bulb for the low beam headlight.

How do I change the headlight on a 2012 Mercedes-Benz CLS550?

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 2012 Mercedes-Benz CLS550?

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 2012 Mercedes-Benz CLS550 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 2012 Mercedes-Benz CLS550?

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 2012 Mercedes-Benz CLS550 is the first model year to use this bulb configuration (2012–2018).

Fitment Guaranteed for 2012 Mercedes-Benz CLS550

What Size Bulbs Does a 2012 Mercedes-Benz CLS550 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 2012 Mercedes-Benz CLS550 Have?

When it comes to nighttime visibility, the 2012 Mercedes-Benz CLS550 relies on an arrangement of 3 specialized bulbs. 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 CLS550's 2007-2018 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 2012 Mercedes-Benz CLS550?

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.

2012 Mercedes-Benz CLS550 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 2012 Mercedes-Benz CLS550's bulbs compare to other years?

The 2012 Mercedes-Benz CLS550 changed bulb sizes from 2011. The previous model year used a different configuration.

The 2013 model continues with the same bulb sizes.

This bulb configuration covers the 2012–2018 model years. ← 2011 2013 →

Finding the best installation guide...

Other CLS550 Years

2018 2017 2016 2015 2014 2013 2011 2010 2009 2008 2007

More from Mercedes-Benz

190D 190E 200 200D 220 220D 230 230S