BMW 740i Headlight Bulb Size

Additional Notes

• The BMW 740i headlight specifications span the D1S, D2S, H1, H7, 9005, and 9006 bulb types across both high beam and low beam positions, with D1S and H7 being the most frequently listed across multiple model years.
• The D1S is a high-intensity discharge bulb that operates without a separate ignition module, as the igniter is integrated directly into the bulb itself. It is used in the BMW 740i for both high beam and low beam positions depending on the model year and headlamp configuration.
• The D2S is also a high-intensity discharge bulb type, but unlike the D1S, it requires an external igniter. On the 740i, the D2S appears exclusively in the low beam position across the 1993-2001 model years when HID headlamps are fitted.
• The D1S and D2S are not interchangeable with each other despite their similar appearance, as the base configurations and ignition systems differ between the two types.
• The H7 bulb is a halogen type with a two-pin PX26d base and a single filament. On the 740i, it serves as the high beam bulb across the 1995-1996, 1997-1998, and 2013-2016 model years, and as the low beam bulb in the 1999-2001 halogen headlamp configuration.
• The H1 bulb is a single-filament halogen type with a P14.5s base. It is listed for the 740i high beam position in the 1999-2001 model years and for the low beam position in the 1995, 1997-1998 halogen headlamp configurations.
• The 9005 bulb, also designated HB3, is a single-filament halogen type with a P20d base. It is listed for the 740i high beam position in the 1993-1994 model years only.
• The 9006 bulb, also designated HB4, shares the same P22d base family as the 9005 but is wired for low beam use and is not interchangeable with the 9005 despite a similar physical form. It is listed for the 740i low beam position in the 1993-1994 halogen headlamp configurations.
• Several model years of the BMW 740i list two distinct bulb sizes for the same beam position, reflecting the availability of both halogen and HID headlamp configurations as separate factory options within the same year.
• The 2011-2012 model years list D1S as the sole low beam bulb without a conditional headlamp notation, while the 2013-2016 entries specify D1S explicitly under the HID headlamp condition, indicating a difference in how the fitment was documented across those years.