What is the low beam headlight bulb size for a 1991 BMW 735iL?

The 1991 BMW 735iL 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 1991 BMW 735iL?

The high beam bulb size for the 1991 BMW 735iL is 9005.

Why are my 1991 BMW 735iL headlights dim?

Dim headlights on a 1991 BMW 735iL 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 1991 BMW 735iL fog light?

The 1991 BMW 735iL uses a H1 bulb for the fog light position.

Is the 1991 BMW 735iL single or dual beam?

The 1991 BMW 735iL uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 1991 BMW 735iL?

Yes, the 1991 BMW 735iL 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.

Does the 1991 BMW 735iL have fog lights?

Yes, the 1991 BMW 735iL takes a H1 bulb for the fog light position.

Did the 1991 BMW 735iL change headlight bulb sizes from the previous year?

Yes — the 1991 BMW 735iL uses different bulb sizes than the 1990 model. The 1991 generation introduced this bulb configuration.

Is the 1991 BMW 735iL the first or last year to use 9006 bulbs?

The 1991 BMW 735iL is the only year in the 1991 generation to use the 9006 bulb for the low beam headlight.

How do I change the headlight on a 1991 BMW 735iL?

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. Note: BMW vehicles use a CANbus system, so LED replacements may need an anti-flicker decoder. The whole process typically takes 10 to 30 minutes per side depending on accessibility.

Are LED headlights legal for a 1991 BMW 735iL?

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 1991 BMW 735iL 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 1991 BMW 735iL?

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. Since the BMW uses CANbus monitoring, choose a CANbus-compatible LED kit to avoid dashboard errors.

The 1991 BMW 735iL has a unique bulb configuration not shared with adjacent model years.

Fitment Guaranteed for 1991 BMW 735iL

What Size Bulbs Does a 1991 BMW 735iL 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 BMW 735iL Have?

Lighting on the 1991 BMW 735iL is managed by a total of 6 bulbs, covering everything from primary headlights to signal indicators. It features a standard 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 late years of the 735iL's 1988-1992 production span. Note that BMW vehicles typically feature a CANbus electrical monitor that checks for specific bulb resistance.

LED Flicker Warning

This vehicle is known to use a CANbus system. Installing standard LEDs may cause flickering.

Use a CANbus decoder.

Can You Put LED Bulbs in a 1991 BMW 735iL?

Upgrading to LED is one of the most effective ways to modernize your BMW'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. Because BMW utilizes a CANbus system, standard LED bulbs may cause "bulb out" errors on your dashboard. Always opt for "Error-Free" or CANbus-ready kits which include the necessary resistors. Don't forget the H1 fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

1991 BMW 735iL Bulb Size Chart

Position	Bulb Size	Shop
Side Marker	W5W	Buy W5W →
Low Beam	9006	Buy 9006 →
Fog Light	H1	Buy H1 →
High Beam	9005	Buy 9005 →
Turn Signal Front	7528	Buy 7528 →
Parking Light	7528	Buy 7528 →

How do the 1991 BMW 735iL's bulbs compare to other years?

The 1991 BMW 735iL 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 →

Finding the best installation guide...

Other 735iL Years

1992 1990 1989 1988

Other Vehicles That Use 9006 Bulbs

2020 GMC Savana 2500 2020 GMC Savana 3500 2017 Mitsubishi Lancer 2016 Chevrolet Express 1500-3500 2015 Chevrolet Express 4500 2015 GMC Savana 4500

9006 Comparisons

9005 vs 9006 9006 vs H11 9006 vs HB4