Audi A4 (MK4) 2008-2015 Light Bulbs

Most modern vehicles (generally 2004/2005 onwards) use a “bulb failure warning system” that monitors your bulbs via the car's CANbus. Because LEDs draw less power than halogens, they can trigger a false “bulb out” or “check light” warning, or cause flickering.

• Older vehicles (pre-2004/2005): it's unlikely you'll need CANbus bulbs.
• Newer vehicles, especially German makes such as Audi, BMW, Mercedes and VW: you almost certainly will.
• Not sure? Remove one of the bulbs in question and check for a dashboard warning. If an error shows, you'll need CANbus bulbs.

On some sensitive vehicles you may also need an external CANbus decoder (error canceller / load resistor). We stock standard LED upgrades, CANbus error-free versions and external decoders, so you can choose the right solution without the risk of warning lights or MOT issues.

Some vehicles use specific bulb holders or locking mechanisms to secure the bulb in the headlight housing. Even when the bulb type is correct (e.g. H7, H1, H4), it may not lock securely without a vehicle-specific holder or adaptor.

This is especially common on BMW, Mercedes, Audi and VW headlight systems, and on newer vehicles where the holder forms part of the headlight mounting. Without the correct holder the bulb may not sit in the right position, affecting beam pattern and light output.

We stock a wide range of vehicle-specific holders and adaptors. If you're unsure, check how your halogen bulb is installed, or contact our support team with photos and we'll help identify the right one.

All of the bulbs shown for your application (for example, a dipped beam) will fit your vehicle — you may simply see more than one option (e.g. multiple H7 bulbs). The right choice depends on what you're looking for:

• Direct replacement or upgrade? A standard like-for-like, or brighter/whiter output.
• CANbus compatibility? Some vehicles require error-free bulbs to prevent dashboard errors.
• Holder/adaptor required? Certain makes and models need an additional holder to fit LEDs securely.
• Brightness and performance — how much light output you want.
• Budget — options are available at different price points.

The key features of each product are listed on its product page, so you can compare easily and pick the best option for your vehicle.

Our headlight bulb packages are pre-selected bundles designed for customers who want a quick, easy way to buy everything needed for their specific make, model and year, so individual items can't be swapped within a package.

If you only want some of the items (for example, dipped beam and main beam bulbs but not the indicators), you can simply buy the products individually — just add the ones you need to your basket. You can also add extra products alongside a package.

If we don't currently list a package for your vehicle and you think one would be useful, contact our customer service team and we'll be happy to create one.