What is the low beam headlight bulb size for a 2009 Mercury Mariner?

The 2009 Mercury Mariner uses a H13 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 Mercury Mariner?

The high beam bulb size for the 2009 Mercury Mariner is N/A.

Why are my 2009 Mercury Mariner headlights dim?

Dim headlights on a 2009 Mercury Mariner can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a H13 LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2009 Mercury Mariner fog light?

The 2009 Mercury Mariner uses a H10 bulb for the fog light position.

Is the 2009 Mercury Mariner single or dual beam?

The 2009 Mercury Mariner 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 Mercury Mariner?

Yes, the 2009 Mercury Mariner comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H13 LED conversion kit for the low beams.

Does the 2009 Mercury Mariner have fog lights?

Yes, the 2009 Mercury Mariner takes a H10 bulb for the fog light position.

Did the 2009 Mercury Mariner change headlight bulb sizes from the previous year?

Yes — the 2009 Mercury Mariner uses different bulb sizes than the 2008 model. The 2009 generation introduced this bulb configuration.

Is the 2009 Mercury Mariner the first or last year to use H13 bulbs?

The 2009 Mercury Mariner is the only year in the 2009 generation to use the H13 bulb for the low beam headlight.

How do I change the headlight on a 2009 Mercury Mariner?

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 H13 bulb counter-clockwise to remove it, then insert the new bulb and reassemble. The whole process typically takes 10 to 30 minutes per side depending on accessibility.

Are LED headlights legal for a 2009 Mercury Mariner?

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 H13 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 Mercury Mariner headlights?

A pair of halogen H13 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 Mercury Mariner?

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 H13 position are available as direct plug-and-play replacements.

The 2009 Mercury Mariner has a unique bulb configuration not shared with adjacent model years.

Fitment Guaranteed for 2009 Mercury Mariner

What Size Bulbs Does a 2009 Mercury Mariner Use?

Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.

Installation Difficulty

Easy (Plug and Play)

Est. Replacement Cost

$15 - $40 (Halogen) / $30+ (LED)

What Lighting System Does the 2009 Mercury Mariner Have?

The 2009 Mercury Mariner utilizes a refined lighting configuration featuring 9 distinct bulb positions. It features a comprehensive lighting system powered by a dual-bulb halogen configuration using separate H13 low beam and high beam bulbs for precise light distribution. This model belongs to the mid years of the Mariner's 2005-2011 production span.

Can You Put LED Bulbs in a 2009 Mercury Mariner?

Upgrading to LED is one of the most effective ways to modernize your Mercury's appearance and safety profile. We recommend starting your upgrade with the H13 low beams, as they see the most use. Adding a matching LED kit later will complete the look and ensure consistent lighting performance. Don't forget the H10 fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

2009 Mercury Mariner Bulb Size Chart

Position	Bulb Size	Shop
Fog Light	H10	Buy H10 →
Low Beam	H13	Buy H13 →
Side Marker	3157CK	Buy 3157CK →
Parking Light	3457NA	Buy 3457NA →
Brake Light	W5W	Buy W5W →
License Plate	168	Buy 168 →
Reverse Light	921	Buy 921 →
Turn Signal Rear	3157CK	Buy 3157CK →
Tail Light	3157CK	Buy 3157CK →