Volkswagen GTI Headlight Bulb Size

Additional Notes

• The H7 bulb is the most widely used type across the Volkswagen GTI headlight specifications, appearing in both high beam and low beam positions across multiple model years and headlamp system variants. It is a single-filament halogen bulb with a PX26d base, rated at 12V and 55W, and holds ECE approval along with recognition in the US and Japan.
• The D1S and D3S are HID (xenon) discharge bulbs, each rated at 35W, though they operate at different voltages. The D1S runs at 85V while the D3S runs at 42V. Both feature an integral ignitor and are designed for projector-type housings, but they use different bases (PK32d-2 for D1S and PK32d-5 for D3S), making them non-interchangeable despite their shared wattage and general function.
• The D2S differs from the D1S and D3S in that it requires an external ignitor rather than having one built into the bulb. It uses a P32d-2 base and operates at 85V, 35W. This external ignitor dependency is a critical fitment distinction when sourcing a replacement.
• The H15 is a dual-filament halogen bulb with a PGJ23t-1 base, rated at 12V with a 55W high-beam filament and a 15W secondary filament. Its dual-filament design sets it apart from the single-filament halogen types listed in the same specifications and means it serves a combined function within a single housing.
• The Volkswagen GTI (2010-2015) equipped with HID headlamps used the D1S for both high and low beam positions, while the 2015-2018 HID-equipped variants transitioned to the D3S. These two bulb types are not interchangeable due to differences in base type and operating voltage.
• For the 2006-2009 GTI, the low beam HID configuration used the D2S, which requires an external ignitor. This contrasts with the D1S used in later HID-equipped years, which has the ignitor integrated into the bulb itself. Substituting one for the other is not supported by the specifications.
• The 2021 GTI high beam position lists both H11 and H9 as applicable bulb sizes, indicating that more than one headlamp configuration was available for that year. The H9 operates at a higher wattage (65W) than the H11 (55W), and while both use similar single-filament halogen construction, their bases differ (PGJ19-5 for H9 versus PGJ19-2 for H11), making them physically non-interchangeable.
• The H11 and H7 are both listed for the 2021 GTI low beam position, again reflecting multiple headlamp system variants for that year. The H11 uses a PGJ19-2 base while the H7 uses a PX26d base, and despite sharing the same 12V, 55W rating, the two bulbs are not cross-compatible due to their different base designs.
• All bulb types listed in the specifications conform to the ECE standard, which governs lighting equipment across Europe and much of the world. The halogen types H7, H11, and H9 also carry US approval, while the HID types D1S, D2S, and D3S are ECE-rated without a separate US-specific designation noted in the specifications.
• The 2006-2009 GTI high beam position lists only H7, with no HID variant noted for those years, whereas the low beam for the same period includes both H7 and D2S options depending on headlamp type. This means the high and low beam bulb types can differ within the same vehicle when HID low beams are fitted.