2 Years Available
BMW 340i Light Bulb Sizes
Complete bulb size reference for the BMW 340i from 2017 to 2018. Find headlight, fog light, turn signal, and brake light bulb sizes for every model year.
Every BMW 340i from 2017 to 2018 uses the same H7 LED low beam bulb — once you confirm your year is within this range, you only need one part number.
Year Range
2017 – 2018
2 model yearsBulb Sizes Across Years
| Position | Bulb Type(s) | Years | Status |
|---|---|---|---|
| Low Beam | H7 LED(2017–2018) | 2 years | Consistent |
| High Beam | H7 LED(2017–2018) | 2 years | Consistent |
| Fog Light | H8 LED(2017–2018) | 2 years | Consistent |
| Brake Light | LED Bulb(2017–2018) | 2 years | Consistent |
| Side Marker | LED Bulb(2017–2018) | 2 years | Consistent |
| Turn Signal Front | 3457NA LED(2017–2018) | 2 years | Consistent |
| Turn Signal Rear | LED Bulb(2017–2018) | 2 years | Consistent |
| Dome Light | 2825(2017–2018) | 2 years | Consistent |
| License Plate | LED Bulb(2017–2018) | 2 years | Consistent |
| Map Light | LED Bulb(2017–2018) | 2 years | Consistent |
| Parking Light | 3457NA(2017–2018) | 2 years | Consistent |
| Reverse Light | LED Bulb(2017–2018) | 2 years | Consistent |
| Trunk Light | LED Light(2017–2018) | 2 years | Consistent |
Common 340i Replacement Parts
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Frequently Asked Questions
We have bulb size data for the BMW 340i from 2017 to 2018, covering 2 model years. Select your year below for a complete position-by-position bulb chart.
No, the BMW 340i has used the H7 LED low beam bulb consistently across all 2 model years in our database. Any year in the 2017–2018 range uses the same bulb.
The BMW 340i uses a H7 LED bulb for the low beam (same bulb serves both high and low beam via dual filament), and a H8 LED for the fog lights. Select your year below for the exact fitment chart.
Yes. The BMW 340i uses a H7 LED low beam, and direct-fit LED conversion kits for that size are widely available. LED upgrades typically produce 2–3× more light output than stock halogen and last 25,000+ hours. Look for a DOT-compliant kit with a proper beam cutoff pattern.
Select your model year from the list below. Each year page shows every bulb position — low beam, high beam, fog light, turn signal, and brake light — with the correct size and a link to buy it on Amazon.