What is the low beam headlight bulb size for a 1973 BMW 3.0CSi?

The 1973 BMW 3.0CSi uses a H5006 bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 1973 BMW 3.0CSi?

The high beam bulb size for the 1973 BMW 3.0CSi is H5001.

Why are my 1973 BMW 3.0CSi headlights dim?

Dim headlights on a 1973 BMW 3.0CSi can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a H5006 LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 1973 BMW 3.0CSi fog light?

The 1973 BMW 3.0CSi 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 1973 BMW 3.0CSi single or dual beam?

The 1973 BMW 3.0CSi uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 1973 BMW 3.0CSi?

Yes, the 1973 BMW 3.0CSi comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H5006 LED conversion kit for the low beams.

Did the 1973 BMW 3.0CSi change headlight bulb sizes from the previous year?

No — the 1973 BMW 3.0CSi uses the same bulb sizes as the 1972 model. This configuration has been consistent across the 1972–1974 generation.

How do I change the headlight on a 1973 BMW 3.0CSi?

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 H5006 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 1973 BMW 3.0CSi?

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 H5006 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 1973 BMW 3.0CSi headlights?

A pair of halogen H5006 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 1973 BMW 3.0CSi?

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 H5006 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 1973 BMW 3.0CSi shares its bulb sizes with the 1972–1974 generation.

Fitment Guaranteed for 1973 BMW 3.0CSi

What Size Bulbs Does a 1973 BMW 3.0CSi 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 1973 BMW 3.0CSi Have?

Lighting on the 1973 BMW 3.0CSi is managed by a total of 5 bulbs, covering everything from primary headlights to signal indicators. It features a standard lighting system powered by a dual-bulb halogen configuration using separate H5006 low beam and H5001 high beam bulbs for precise light distribution. 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 1973 BMW 3.0CSi?

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 H5006 low beams, as they see the most use. Adding a matching H5001 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.

1973 BMW 3.0CSi Bulb Size Chart

Position	Bulb Size	Shop
High Beam	H5001	Buy H5001 →
Low Beam	H5006	Buy H5006 →
Turn Signal Front	1156	Buy 1156 →
Brake Light	1156	Buy 1156 →
Turn Signal Rear	1156	Buy 1156 →

How do the 1973 BMW 3.0CSi's bulbs compare to other years?

The 1973 BMW 3.0CSi uses the same bulbs as the 1972 model.

The 1974 model continues with the same bulb sizes.

This bulb configuration covers the 1972–1974 model years. ← 1972 1974 →

Finding the best installation guide...

Other 3.0CSi Years

1974 1972 1971

Other Vehicles That Use H5006 Bulbs

1991 Isuzu Impulse 1989 Jaguar Vanden Plas 1989 Jaguar XJ12 1989 Jaguar XJ6 1989 Jaguar XJS 1988 Ferrari Testarossa