What is the low beam headlight bulb size for a 1991 Toyota Tercel?

The 1991 Toyota Tercel uses a H4666 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 1991 Toyota Tercel?

The high beam bulb size for the 1991 Toyota Tercel is H4666 LED.

Why are my 1991 Toyota Tercel headlights dim?

Dim headlights on a 1991 Toyota Tercel can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a H4666 LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 1991 Toyota Tercel fog light?

The 1991 Toyota Tercel uses a LED Fog Light bulb for the fog light position.

Is the 1991 Toyota Tercel single or dual beam?

The 1991 Toyota Tercel 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 1991 Toyota Tercel?

Yes, the 1991 Toyota Tercel comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H4666 LED LED conversion kit for the low beams.

Does the 1991 Toyota Tercel have fog lights?

Yes, the 1991 Toyota Tercel takes a LED Fog Light bulb for the fog light position.

Did the 1991 Toyota Tercel change headlight bulb sizes from the previous year?

Yes — the 1991 Toyota Tercel uses different bulb sizes than the 1990 model. The 1991 generation introduced this bulb configuration.

Is the 1991 Toyota Tercel the first or last year to use H4666 LED bulbs?

The 1991 Toyota Tercel is the only year in the 1991 generation to use the H4666 LED bulb for the low beam headlight.

How do I change the headlight on a 1991 Toyota Tercel?

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 H4666 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 1991 Toyota Tercel?

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 H4666 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 1991 Toyota Tercel headlights?

A pair of halogen H4666 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 1991 Toyota Tercel?

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 H4666 LED position are available as direct plug-and-play replacements.

The 1991 Toyota Tercel has a unique bulb configuration not shared with adjacent model years.

Fitment Guaranteed for 1991 Toyota Tercel

What Size Bulbs Does a 1991 Toyota Tercel 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 1991 Toyota Tercel Have?

Owners of the 1991 Toyota Tercel will find a total of 13 lighting elements throughout the vehicle's exterior. It features an extensive lighting system powered by a halogen-based setup where a single H4666 LED dual-filament bulb handles both low and high beam duties within the same reflector. This model belongs to the mid years of the Tercel's 1980-1999 production span.

Can You Put LED Bulbs in a 1991 Toyota Tercel?

For a Toyota built for the road and trail, LED upgrades provide the high-contrast lighting needed for better obstacle detection. Since your Tercel uses a single H4666 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 LED Fog Light fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

1991 Toyota Tercel Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	H4666 LED	Buy H4666 LED →
High Beam	H4666 LED	Buy H4666 LED →
Fog Light	LED Fog Light	Buy LED Fog Light →
Brake Light	921 LED	Buy 921 LED →
Side Marker	194 LED	Buy 194 LED →
Turn Signal Front	1157 LED	Buy 1157 LED →
Turn Signal Rear	1156 LED	Buy 1156 LED →
Reverse Light	1156	Buy 1156 →
Dome Light	DE3175	Buy DE3175 →
License Plate	168	Buy 168 →
Parking Light	1157	Buy 1157 →
Trunk Light	LED Light	Buy LED Light →
Tail Light	1157	Buy 1157 →

How do the 1991 Toyota Tercel's bulbs compare to other years?

The 1991 Toyota Tercel changed bulb sizes from 1990. The previous model year used a different configuration.

The 1992 model switched to a different bulb configuration.

This bulb configuration covers the 1991 model years. ← 1990 1992 →

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Other Tercel Years

1999 1998 1997 1996 1995 1994 1993 1992 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980

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