What is the low beam headlight bulb size for a 2009 Mercedes-Benz S550?

The 2009 Mercedes-Benz S550 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 2009 Mercedes-Benz S550?

The high beam bulb size for the 2009 Mercedes-Benz S550 is H7.

Why are my 2009 Mercedes-Benz S550 headlights dim?

Dim headlights on a 2009 Mercedes-Benz S550 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 2009 Mercedes-Benz S550 fog light?

The 2009 Mercedes-Benz S550 uses a H11 bulb for the fog light position.

Is the 2009 Mercedes-Benz S550 single or dual beam?

The 2009 Mercedes-Benz S550 uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 2009 Mercedes-Benz S550?

Yes, the 2009 Mercedes-Benz S550 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.

Does the 2009 Mercedes-Benz S550 have fog lights?

Yes, the 2009 Mercedes-Benz S550 takes a H11 bulb for the fog light position.

Did the 2009 Mercedes-Benz S550 change headlight bulb sizes from the previous year?

Yes — the 2009 Mercedes-Benz S550 uses different bulb sizes than the 2008 model. The 2009–2010 generation introduced this bulb configuration.

Is the 2009 Mercedes-Benz S550 the first or last year to use N/A bulbs?

The 2009 Mercedes-Benz S550 is the first year in the 2009–2010 generation to use the N/A bulb for the low beam headlight.

How do I change the headlight on a 2009 Mercedes-Benz S550?

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 2009 Mercedes-Benz S550?

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 2009 Mercedes-Benz S550 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 2009 Mercedes-Benz S550?

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 2009 Mercedes-Benz S550 is the first model year to use this bulb configuration (2009–2010).

Fitment Guaranteed for 2009 Mercedes-Benz S550

What Size Bulbs Does a 2009 Mercedes-Benz S550 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 2009 Mercedes-Benz S550 Have?

Lighting on the 2009 Mercedes-Benz S550 is managed by a total of 9 bulbs, covering everything from primary headlights to signal indicators. It features a comprehensive lighting system powered by a dual-bulb halogen configuration using separate low beam and H7 high beam bulbs for precise light distribution. This model belongs to the mid years of the S550's 2007-2013 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 2009 Mercedes-Benz S550?

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 H7 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. Don't forget the H11 fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

2009 Mercedes-Benz S550 Bulb Size Chart

Position	Bulb Size	Shop
Fog Light	H11	Buy H11 →
High Beam	H7	Buy H7 →
Side Marker	W5W	Buy W5W →
Reverse Light	921	Buy 921 →
Parking Light	W5W	Buy W5W →
License Plate	W5W	Buy W5W →
Dome Light	3886X	Buy 3886X →
Map Light	3886X	Buy 3886X →
Trunk Light	W5W	Buy W5W →

How do the 2009 Mercedes-Benz S550's bulbs compare to other years?

The 2009 Mercedes-Benz S550 changed bulb sizes from 2008. The previous model year used a different configuration.

The 2010 model continues with the same bulb sizes.

This bulb configuration covers the 2009–2010 model years. ← 2008 2010 →

Finding the best installation guide...

Other S550 Years

2013 2012 2011 2010 2008 2007

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