What is the low beam headlight bulb size for a 1999 Mitsubishi Diamante?

The 1999 Mitsubishi Diamante uses a 9006 bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 1999 Mitsubishi Diamante?

The high beam bulb size for the 1999 Mitsubishi Diamante is 9005.

Why are my 1999 Mitsubishi Diamante headlights dim?

Dim headlights on a 1999 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 conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 1999 Mitsubishi Diamante fog light?

The 1999 Mitsubishi Diamante 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 1999 Mitsubishi Diamante single or dual beam?

The 1999 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 1999 Mitsubishi Diamante?

Yes, the 1999 Mitsubishi Diamante comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a 9006 LED conversion kit for the low beams.

Did the 1999 Mitsubishi Diamante change headlight bulb sizes from the previous year?

Yes — the 1999 Mitsubishi Diamante uses different bulb sizes than the 1998 model. The 1999 generation introduced this bulb configuration.

Is the 1999 Mitsubishi Diamante the first or last year to use 9006 bulbs?

The 1999 Mitsubishi Diamante is the only year in the 1999 generation to use the 9006 bulb for the low beam headlight.

How do I change the headlight on a 1999 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 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 1999 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 kit that is designed as a direct replacement and produces a proper cutoff pattern without excessive glare.

How much does it cost to replace 1999 Mitsubishi Diamante headlights?

A pair of halogen 9006 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 1999 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 position are available as direct plug-and-play replacements.

The 1999 Mitsubishi Diamante has a unique bulb configuration not shared with adjacent model years.

Fitment Guaranteed for 1999 Mitsubishi Diamante

What Size Bulbs Does a 1999 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 1999 Mitsubishi Diamante Have?

The 1999 Mitsubishi Diamante utilizes a refined lighting configuration featuring 13 distinct bulb positions. It features an extensive lighting system powered by a dual-bulb halogen configuration using separate 9006 low beam and 9005 high beam bulbs for precise light distribution. This model belongs to the mid years of the Diamante's 1992-2004 production span.

Can You Put LED Bulbs in a 1999 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 low beams, as they see the most use. Adding a matching 9005 LED kit later will complete the look and ensure consistent lighting performance.

1999 Mitsubishi Diamante Bulb Size Chart

Position	Bulb Size	Shop
Turn Signal Front	1156	Buy 1156 →
Side Marker	168	Buy 168 →
High Beam	9005	Buy 9005 →
Low Beam	9006	Buy 9006 →
Reverse Light	1156	Buy 1156 →
Turn Signal Rear	3497	Buy 3497 →
Brake Light	3496	Buy 3496 →
Tail Light	3496	Buy 3496 →
Parking Light	168	Buy 168 →
License Plate	168	Buy 168 →
Dome Light	DE3175	Buy DE3175 →
Trunk Light	DE3022	Buy DE3022 →
Map Light	168	Buy 168 →