Below is a list of light bulb types used in 2000-2009 AUDI A4 lighting system, covering convertible, estate and saloon 4-door vehicles.
| Position | Type | Get on Amzn US | Get on Amzn UK |
|---|---|---|---|
| Headlight (low beam) | |||
| H7 | $5.64 | £4.88 | |
| D1S | $46.99 | £31.20 | |
| D2S | $37.03 | £25.99 | |
| Headlight (high beam) | |||
| H7 | $5.64 | £4.88 | |
| H9 | $11.99 | £16.64 | |
| D1S | $46.99 | £31.20 | |
| Parking light | |||
| H6W | $8.45 | £11.88 | |
| W5W | $6.91 | £2.69 | |
| W3W | $6.57 | £2.89 | |
| Fog light | |||
| H11 | $15.99 | £11.05 | |
| Front indicator (turn) signal | |||
| PY21W | $20.00 | £9.99 | |
| P21W | $7.99 | £5.02 | |
| Side direction indicator | |||
| WY5W | $9.57 | £3.29 | |
| Daytime running light | |||
| P21W | $7.99 | £5.02 | |
| Side light | |||
| R5W | $5.21 | £1.94 |
| Position | Type | Get on Amzn US | Get on Amzn UK |
|---|---|---|---|
| Rear indicator (turn) signal | |||
| PY21W | $20.00 | £9.99 | |
| Tail light | |||
| P21/5W | $12.93 | £5.29 | |
| R5W | $5.21 | £1.94 | |
| Brake light | |||
| P21/5W | $12.93 | £5.29 | |
| Back-up light | |||
| P21W | $7.99 | £5.02 | |
| Rear fog light | |||
| P21W | $7.99 | £5.02 | |
| License plate light | |||
| C5W | $8.99 | £2.37 |
| Position | Type | Get on Amzn US | Get on Amzn UK |
|---|---|---|---|
| Interior light | |||
| C10W | $7.41 | £2.69 | |
| Door safety light | |||
| W5W | $6.91 | £2.69 | |
| Boot light | |||
| W3W | $6.57 | £2.89 | |
| W5W | $6.91 | £2.69 | |
| Entry light | |||
| W5W | $6.91 | £2.69 | |
| Footwell light | |||
| W5W | $6.91 | £2.69 | |
| Reading light | |||
| W5W | $6.91 | £2.69 | |
| T5W | |||
| Glove compartment light | |||
| W5W | $6.91 | £2.69 | |
| W3W | $6.57 | £2.89 | |
| Door light | |||
| W5W | $6.91 | £2.69 |
Light bulb sizes for other AUDI A4 generations: A4 (B5) / A4 (B7) / A4 (B8) / A4 (B9)