What is the low beam headlight bulb size for a 2004 Mitsubishi Diamante?

The 2004 Mitsubishi Diamante uses a 9003 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 2004 Mitsubishi Diamante?

The high beam bulb size for the 2004 Mitsubishi Diamante is 9003 LED.

Why are my 2004 Mitsubishi Diamante headlights dim?

Dim headlights on a 2004 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 9003 LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2004 Mitsubishi Diamante fog light?

The 2004 Mitsubishi Diamante uses a 9006 LED bulb for the fog light position.

Is the 2004 Mitsubishi Diamante single or dual beam?

The 2004 Mitsubishi Diamante uses a single bulb (dual filament) headlight system. This means one bulb controls both high and low beams.

Can I install LED bulbs on my 2004 Mitsubishi Diamante?

Yes, the 2004 Mitsubishi Diamante comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a 9003 LED LED conversion kit for the low beams.

Does the 2004 Mitsubishi Diamante have fog lights?

Yes, the 2004 Mitsubishi Diamante takes a 9006 LED bulb for the fog light position.

Did the 2004 Mitsubishi Diamante change headlight bulb sizes from the previous year?

Yes — the 2004 Mitsubishi Diamante uses different bulb sizes than the 2003 model. The 2004 generation introduced this bulb configuration.

Is the 2004 Mitsubishi Diamante the first or last year to use 9003 LED bulbs?

The 2004 Mitsubishi Diamante is the only year in the 2004 generation to use the 9003 LED bulb for the low beam headlight.

How do I change the headlight on a 2004 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 9003 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 2004 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 9003 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 2004 Mitsubishi Diamante headlights?

A pair of halogen 9003 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 2004 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 9003 LED position are available as direct plug-and-play replacements.

The 2004 Mitsubishi Diamante has a unique bulb configuration not shared with adjacent model years.

Fitment Guaranteed for 2004 Mitsubishi Diamante

What Size Bulbs Does a 2004 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 2004 Mitsubishi Diamante Have?

Lighting on the 2004 Mitsubishi Diamante is managed by a total of 14 bulbs, covering everything from primary headlights to signal indicators. It features an extensive lighting system powered by a halogen-based setup where a single 9003 LED dual-filament bulb handles both low and high beam duties within the same reflector. This model belongs to the late years of the Diamante's 1992-2004 production span.

Can You Put LED Bulbs in a 2004 Mitsubishi Diamante?

Upgrading to LED is one of the most effective ways to modernize your Mitsubishi's appearance and safety profile. Since your Diamante uses a single 9003 LED bulb for both high and low beams, ensure your chosen LED kit is "dual-beam" compatible. This allows the LED circuitry to mimic the two-filament design of the original halogen bulb. Don't forget the 9006 LED fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

2004 Mitsubishi Diamante Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	9003 LED	Buy 9003 LED →
High Beam	9003 LED	Buy 9003 LED →
Fog Light	9006 LED	Buy 9006 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 2004 Mitsubishi Diamante's bulbs compare to other years?

The 2004 Mitsubishi Diamante changed bulb sizes from 2003. The previous model year used a different configuration.

This bulb configuration covers the 2004 model years. ← 2003

Finding the best installation guide...

Other Diamante Years

2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992

More from Mitsubishi

3000GT Cordia Eclipse Eclipse Cross Endeavor Expo Expo LRV Galant

Other Vehicles That Use 9003 LED Bulbs

2023 Kia Rio 2021 Toyota Tundra 2020 Honda Fit 2019 MINI Cooper 2019 Nissan Micra 2019 Nissan Versa