What is the low beam headlight bulb size for a 2012 BMW 135i?

The 2012 BMW 135i uses a HID-D1S 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 2012 BMW 135i?

The high beam bulb size for the 2012 BMW 135i is HID-D1S LED.

Why are my 2012 BMW 135i headlights dim?

Dim headlights on a 2012 BMW 135i can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a HID-D1S LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2012 BMW 135i fog light?

The 2012 BMW 135i uses a H8 LED bulb for the fog light position.

Is the 2012 BMW 135i single or dual beam?

The 2012 BMW 135i 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 2012 BMW 135i?

Yes, the 2012 BMW 135i comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a HID-D1S LED LED conversion kit for the low beams.

Does the 2012 BMW 135i have fog lights?

Yes, the 2012 BMW 135i takes a H8 LED bulb for the fog light position.

How do I change the headlight on a 2012 BMW 135i?

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 HID-D1S LED 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 2012 BMW 135i?

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 HID-D1S 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 2012 BMW 135i headlights?

A pair of HID HID-D1S LED bulbs costs $50 to $150. 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 2012 BMW 135i?

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 HID-D1S LED 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.

Fitment Guaranteed for 2012 BMW 135i

What Size Bulbs Does a 2012 BMW 135i Use?

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

Installation Difficulty

Hard (Tight clearances)

Est. Replacement Cost

$50 - $150 (HID System)

What Lighting System Does the 2012 BMW 135i Have?

Owners of the 2012 BMW 135i will find a total of 12 lighting elements throughout the vehicle's exterior. It features an extensive lighting system powered by premium factory HID/Xenon technology utilizing D1S projector housings for high-intensity output. This model belongs to the late years of the 135i's 2008-2013 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 2012 BMW 135i?

The 2012 BMW 135i is already equipped with factory D1S HID/Xenon headlights. Since HID technology already provides exceptional brightness, we recommend staying with high-quality OEM replacement bulbs rather than attempting an LED retrofit for the primary headlights. However, the H8 LED fog lights are typically halogen and are excellent candidates for an LED upgrade to match the color temperature of your HID headlights.

2012 BMW 135i Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	HID-D1S LED	Buy HID-D1S LED →
High Beam	HID-D1S LED	Buy HID-D1S LED →
Fog Light	H8 LED	Buy H8 LED →
Brake Light	LED Bulb	Buy LED Bulb →
Turn Signal Front	7507 LED	Buy 7507 LED →
Turn Signal Rear	12496 LED	Buy 12496 LED →
Dome Light	2886X	Buy 2886X →
License Plate	LED Bulb	Buy LED Bulb →
Map Light	2886X	Buy 2886X →
Parking Light	2825	Buy 2825 →
Reverse Light	921K	Buy 921K →
Trunk Light	6411	Buy 6411 →