What is the bulb model for the Audi A4L headlight?
3 Answers
Philips D3S-42V35W. Is modification supported: Modification is possible, but must comply with relevant standards. Advantages of modification: The headlights configured at the factory meet basic standards, but vary across different models. Due to production conditions and cost constraints, they only meet minimum requirements. Additionally, headlights may experience brightness degradation over time due to high temperatures and oxidation. Professional modification by certified shops ensures no safety hazards. Key considerations during modification include avoiding full headlight assembly replacement. For models like the KLZ with integrated high and low beams, simply replacing the H4 xenon bulb and ballast is sufficient. Proper modification requires a lens, bulb, and ballast—all three components are essential.
I've been driving for over a decade and am quite familiar with the Audi A4L headlight models. There are significant differences between different years and configurations. The older halogen low beams typically use H7 bulbs, while the high beams use H1. For xenon headlights, the low beams are D3S models, and the high beams are sometimes integrated into the xenon lights, so they don't need to be replaced separately. The newer LED headlights are even more complicated—they're usually whole modules and can't have bulbs replaced individually. I recommend checking the owner's manual first to confirm the year and configuration, or removing the old bulb to check the model number printed on the label for the most accurate information. If you're replacing the bulb yourself, remember to wear gloves and avoid touching the glass directly with your hands, as oils can shorten the bulb's lifespan. If you're really unsure, just go to a professional shop—they can check the VIN code and know exactly what you need, saving you the hassle of buying the wrong model.
As an A4L owner, I just replaced the headlight bulbs last year. My 2017 model uses D3S xenon bulbs for low beams, and surprisingly, there's no separate bulb for high beams—the technician said they're integrated with the low beams. Different model years really vary; my friend's older model uses H7 bulbs. Before attempting a DIY replacement, it's best to check the lighting section of the owner's manual or provide the VIN to parts suppliers to confirm the compatible model. I once tried searching for parts on Taobao by vehicle model, but the delivered bulbs didn't fit—turns out the model year was mislabeled. Now I opt for genuine parts at the dealership. Though more expensive, it gets the job done right the first time, especially since poor headlight sealing can affect waterproofing.
