What is the low beam headlight bulb size for a 1991 Porsche 911?

The 1991 Porsche 911 uses a 9004 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 Porsche 911?

The high beam bulb size for the 1991 Porsche 911 is 9004 LED.

Why are my 1991 Porsche 911 headlights dim?

Dim headlights on a 1991 Porsche 911 can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a 9004 LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 1991 Porsche 911 fog light?

The 1991 Porsche 911 uses a H3 LED bulb for the fog light position.

Is the 1991 Porsche 911 single or dual beam?

The 1991 Porsche 911 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 Porsche 911?

Yes, the 1991 Porsche 911 comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a 9004 LED LED conversion kit for the low beams.

Does the 1991 Porsche 911 have fog lights?

Yes, the 1991 Porsche 911 takes a H3 LED bulb for the fog light position.

How do I change the headlight on a 1991 Porsche 911?

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 9004 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 Porsche 911?

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 9004 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 Porsche 911 headlights?

A pair of halogen 9004 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 Porsche 911?

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 9004 LED position are available as direct plug-and-play replacements.

This vehicle is part of the 1987–1994 Porsche 911 generation. All models in this range share identical light bulb sizes.

Fitment Guaranteed for 1991 Porsche 911

What Size Bulbs Does a 1991 Porsche 911 Use?

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

Installation Difficulty

Hard (Tight clearances)

Est. Replacement Cost

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

What Lighting System Does the 1991 Porsche 911 Have?

When it comes to nighttime visibility, the 1991 Porsche 911 relies on an arrangement of 12 specialized bulbs. It features an extensive lighting system powered by a halogen-based setup where a single 9004 LED dual-filament bulb handles both low and high beam duties within the same reflector. This model belongs to the mid years of the 911's 1980-2019 production span.

Can You Put LED Bulbs in a 1991 Porsche 911?

Upgrading to LED is one of the most effective ways to modernize your Porsche's appearance and safety profile. Since your 911 uses a single 9004 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 H3 LED fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

1991 Porsche 911 Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	9004 LED	Buy 9004 LED →
High Beam	9004 LED	Buy 9004 LED →
Fog Light	H3 LED	Buy H3 LED →
Brake Light	7506 LED	Buy 7506 LED →
Side Marker	3893 LED	Buy 3893 LED →
Turn Signal Front	7528 LED	Buy 7528 LED →
Turn Signal Rear	7506 LED	Buy 7506 LED →
Reverse Light	7506	Buy 7506 →
Dome Light	6411	Buy 6411 →
License Plate	3893	Buy 3893 →
Parking Light	7528	Buy 7528 →
Trunk Light	LED Light	Buy LED Light →

Installation Guide

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Other 911 Years

2019 2018 2017 2016 2015 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1994 1993 1992 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980

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