Audi A4 1998 Bulb Size
Bulb size chart
This 1998 Audi A4 bulb size guide is organized by lighting position so you can quickly verify the correct replacement bulb before you buy. Because Audi used different lamp setups depending on trim, body style, and equipment, checking the exact location on the car is the safest way to match the right fit.
Use this page to compare the bulb size for exterior lights, interior lights, and cargo-area lamps on the 1998 Audi A4. Whether you are replacing a headlight, tail light, license plate bulb, or glove box lamp, the list below helps narrow the search to the correct bulb type for your specific A4.
Fitment can vary on the 1998 Audi A4 depending on market, trim, and lighting package, so it is smart to confirm the bulb already installed in the vehicle before ordering. This is especially important if your car has halogen lighting, HID headlights, or an aftermarket LED conversion, since the bulb base and physical size must still match the housing. Some positions also differ between sedan and Avant models, and a previous owner may have changed sockets or lamps during repairs. If you are unsure, remove the old bulb and compare the number printed on the base with the bulb chart on this page before purchasing replacements.
FAQ
What bulb size does the low beam headlight use on a 1998 Audi A4?
The low beam headlight bulb listed for the 1998 Audi A4 is D2S. This applies to the HID low beam setup shown on the page.
Which bulb is used for the front fog light on this A4?
The front fog light bulb is H1. If one side is out, replace both only if the other bulb is also aged or dim.
What is the rear turn signal bulb size on the 1998 Audi A4?
The rear turn signal bulb is 7506. The same bulb is also listed for the back up reverse light on this model.
Does the 1998 Audi A4 use the same bulb for the brake light and tail light?
Yes. The brake light bulb and tail light bulb are both listed as 7528 on this page.
What bulb fits the license plate lights?
The license plate light bulb is 6418. This is a common interior/exterior lamp size on the 1998 Audi A4.
What bulb is used for the glove box light?
The glove box light bulb is 6418. If the glove box lamp is dim or intermittent, check the socket as well as the bulb.
Which bulb goes in the center high mount stop light?
The center high mount stop light bulb is 2723. Make sure the replacement matches the original length and base style.
What bulb size is used for the front side marker light?
The front side marker light bulb is 2357A. On some versions, related front parking or turn signal positions may use different bulbs depending on trim.
Are the base and Avant interior bulbs the same on the 1998 Audi A4?
Not always. The page shows different bulb listings for base and Avant configurations, including some courtesy, map, and cargo-area lamps. Always match the bulb to the exact lighting position on your car.
What bulb fits the trunk or cargo area light?
The trunk or cargo area light can vary by version. One listing is 6418 for the base model, while Avant configurations may use 194, 7441, or 6486X depending on the setup shown on the vehicle.
Can I switch the 1998 Audi A4 to LED bulbs?
Yes, many owners upgrade to LED bulbs, but the replacement still needs the correct base and size. Some LED bulbs may require polarity checks, load resistors, or CAN-bus-compatible parts depending on the circuit.
How do I confirm the right bulb before ordering?
Check the bulb position on the car, compare it with the chart on this page, and if possible remove the installed bulb to read the number on the base. This is the best way to avoid ordering the wrong part for a 1998 Audi A4.