The 2015 BMW 328i can use two different headlight configurations depending on trim: halogen headlights or xenon/HID headlights. The bulb sizes differ accordingly: halogen uses H7 low beam and H1 high beam, while xenon HID uses D3S bulbs (with the high-beam function typically handled by the same xenon system in Bi-Xenon setups).
To confirm the exact bulb you need, check your owner’s manual, the vehicle’s window sticker or VIN, and inspect the headlight housing for a ballast. Market and trim variations exist, so verifying with a parts lookup or dealer is the safest approach before buying replacements.
Halogen headlights
For 2015 328i models equipped with halogen front headlights, use the sizes listed below for the main headlamps. This configuration is common on earlier or non-xenon trims.
Halogen: quick reference
- Low beam: H7
- High beam: H1
Note: Some versions may have different features or fog-light bulbs; always confirm with a parts lookup for your exact VIN and market.
These are the standard halogen headlight sizes for the 2015 BMW 328i. If your car differs due to market or option packages, verify with a trusted parts source or your dealership.
Xenon HID headlights (Bi-Xenon or adaptive)**
For 2015 328i models with xenon headlights, the low-beam function is generally provided by HID bulbs, and the high-beam function is typically integrated into the xenon system in Bi-Xenon setups. This means the primary replacement bulb is usually D3S.
Xenon: quick reference
- Low beam / High beam: D3S (one bulb handles both in Bi-Xenon setups)
Because the exact arrangement can vary by market and trim, always verify the bulb type using your VIN, owner’s manual, or a parts lookup. If your Xenon system uses a separate high-beam bulb, sizes may differ and you should consult the manual or a BMW technician.
How to identify which system your car has
There are a few quick checks you can perform to determine the correct bulb size without guessing:
Quick checks
- Look for a ballast near the headlight housing. If you see a black box or ballast, you likely have HID/Xenon headlights.
- Inspect the headlight label or the bulbs themselves (accessible from the engine bay or via the wheel well). HID bulbs are typically D3S or similar, while halogen bulbs will be labeled H7, H1, etc.
- Refer to the owner’s manual or check the official build sheet/window sticker to confirm whether the car is equipped with Halogen or Xenon headlights.
If you’re unsure, a quick parts lookup using your VIN or a visit to a BMW dealership can confirm the exact bulb size for your car’s specific build.
Summary
The 2015 BMW 328i can use two main headlight bulb configurations. Halogen headlights typically require H7 for the low beam and H1 for the high beam. Xenon HID headlights generally use D3S bulbs for the low beam, with the high beam often integrated into the Bi-Xenon system (also D3S) in most configurations. Always verify with your VIN/owner manual or a trusted parts source to ensure you buy the correct bulbs for your exact trim and market.