What is the low beam headlight bulb size for a 2003 Mitsubishi Diamante?

The 2003 Mitsubishi Diamante uses a 9006 LED bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 2003 Mitsubishi Diamante?

The high beam bulb size for the 2003 Mitsubishi Diamante is 9005 LED.

Why are my 2003 Mitsubishi Diamante headlights dim?

Dim headlights on a 2003 Mitsubishi Diamante can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a 9006 LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2003 Mitsubishi Diamante fog light?

The 2003 Mitsubishi Diamante uses a H3 LED bulb for the fog light position.

Is the 2003 Mitsubishi Diamante single or dual beam?

The 2003 Mitsubishi Diamante uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 2003 Mitsubishi Diamante?

Yes, the 2003 Mitsubishi Diamante comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a 9006 LED LED conversion kit for the low beams.

Does the 2003 Mitsubishi Diamante have fog lights?

Yes, the 2003 Mitsubishi Diamante takes a H3 LED bulb for the fog light position.

Did the 2003 Mitsubishi Diamante change headlight bulb sizes from the previous year?

Yes — the 2003 Mitsubishi Diamante uses different bulb sizes than the 2002 model. The 2003 generation introduced this bulb configuration.

Is the 2003 Mitsubishi Diamante the first or last year to use 9006 LED bulbs?

The 2003 Mitsubishi Diamante is the only year in the 2003 generation to use the 9006 LED bulb for the low beam headlight.

How do I change the headlight on a 2003 Mitsubishi Diamante?

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 9006 LED 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 2003 Mitsubishi Diamante?

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 9006 LED 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 2003 Mitsubishi Diamante headlights?

A pair of halogen 9006 LED 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 2003 Mitsubishi Diamante?

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 9006 LED position are available as direct plug-and-play replacements.

The 2003 Mitsubishi Diamante has a unique bulb configuration not shared with adjacent model years.

Fitment Guaranteed for 2003 Mitsubishi Diamante

What Size Bulbs Does a 2003 Mitsubishi Diamante 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 2003 Mitsubishi Diamante Have?

When it comes to nighttime visibility, the 2003 Mitsubishi Diamante relies on an arrangement of 14 specialized bulbs. It features an extensive lighting system powered by a dual-bulb halogen configuration using separate 9006 LED low beam and 9005 LED high beam bulbs for precise light distribution. This model belongs to the late years of the Diamante's 1992-2004 production span.

Can You Put LED Bulbs in a 2003 Mitsubishi Diamante?

Upgrading to LED is one of the most effective ways to modernize your Mitsubishi's appearance and safety profile. We recommend starting your upgrade with the 9006 LED low beams, as they see the most use. Adding a matching 9005 LED LED kit later will complete the look and ensure consistent lighting performance. Don't forget the H3 LED fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

2003 Mitsubishi Diamante Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	9006 LED	Buy 9006 LED →
High Beam	9005 LED	Buy 9005 LED →
Fog Light	H3 LED	Buy H3 LED →
Brake Light	921 LED	Buy 921 LED →
Side Marker	168 LED	Buy 168 LED →
Turn Signal Front	1156 LED	Buy 1156 LED →
Turn Signal Rear	7440NA LED	Buy 7440NA LED →
Dome Light	DE3175	Buy DE3175 →
Map Light	168	Buy 168 →
Parking Light	168	Buy 168 →
Reverse Light	921	Buy 921 →
Trunk Light	DE3022	Buy DE3022 →
Tail Light	7443	Buy 7443 →
License Plate	168	Buy 168 →

How do the 2003 Mitsubishi Diamante's bulbs compare to other years?

The 2003 Mitsubishi Diamante changed bulb sizes from 2002. The previous model year used a different configuration.

The 2004 model switched to a different bulb configuration.

This bulb configuration covers the 2003 model years. ← 2002 2004 →

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Other Diamante Years

2004 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992

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