So I know that the rear fog light is basically pointless. I used to use it on occasions when it was really foggy but the bulb went out. I have searched to see what kind of bulb it taks and I never get any results. I do not want to go to the dealership due to ridiculous prices and I dont want the message to show up anymore when I turn on my light that my fog light is out. Anyone know what bulb it takes?

 

take the bulb out and go to the parts store

 

2003 AUDI A4 Sedan (With halogen capsule headlamps)

Low beam headlamp
H7
H7SU Silverstar ULTRA for Ultra Night Vision - The Whitest and Brightest Halogen
H7ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
H7XV XtraVision Halogen - The Brighter Light
H7CB Cool Blue Halogen - The Whiter Light

High beam headlamp
H7
H7SU Silverstar ULTRA for Ultra Night Vision - The Whitest and Brightest Halogen
H7ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
H7XV XtraVision Halogen - The Brighter Light
H7CB Cool Blue Halogen - The Whiter Light

Parking light
3457ALL
3457AST Silverstar Signal Lighting: Complete the Look: Crisp, Clean, Style

Front turn signal
2827
3457ALL
3457AST Silverstar Signal Lighting: Complete the Look: Crisp, Clean, Style

Rear turn signal
7507
7507AST Silverstar Signal Lighting: Complete the Look: Crisp, Clean, Style
7507LL Long Life Upgrade: Up to twice the life of the standard lamp

Tail light
5007
5007LL Long Life Upgrade: Up to twice the life of the standard lamp
7225
7225LL Long Life Upgrade: Up to twice the life of the standard lamp

Stop light
7225
7225LL Long Life Upgrade: Up to twice the life of the standard lamp

High mount stop light
Assembly

Fog/Driving light
H11
H11XV XtraVision Halogen - The Brighter Light

License plate
6418
6418LL Long Life Upgrade: Up to twice the life of the standard lamp

Back up light
7506
7506LL Long Life Upgrade: Up to twice the life of the standard lamp

Front sidemarker
3457ALL
3457AST Silverstar Signal Lighting: Complete the Look: Crisp, Clean, Style

Rear sidemarker
7528
7528LL Long Life Upgrade: Up to twice the life of the standard lamp

Glove box
2825
2825LL Long Life Upgrade: Up to twice the life of the standard lamp

Map light
64111

Dome light
6411

Step/Courtesy light
2825
2825LL Long Life Upgrade: Up to twice the life of the standard lamp

Trunk/Cargo area
6418
6418LL Long Life Upgrade: Up to twice the life of the standard lamp

Under hood light
6411

Daytime running light
2825
2825LL Long Life Upgrade: Up to twice the life of the standard lamp

 

whered you get that^^?

 

That is from Sylvania's Bulb Replacement Guide

 

Yes. I have checked that list alos but that does not help me with the rear fog light..

 

Y not just take the bulb out look at the bottom and the number on the side of the bulb write it down and go to the autostore and get the same one. The bottom will tell u what u are looking for.

 

It takes the same as the brake/reverse lights. Reverse lights I can verify, I got Xenon (non-HID) bulbs for reverse, and popped the reverse bulbs into the empty one that's not powered. Working on wiring it up currently, but they fit, and the powered one works fine.

 

Yeah I took the bulb out. Its comparable to the one for the tail light for just when you are driving that shows that your lights are on.. Not exactly sure what you would call it but I put that one in the fog light socket and it came up as a missing bulb still. my guess is because its not the same wattage because the rear fog light is much brighter?? The one that was in the fog light socket had no markings on it whatsoever.

 

Odd, I haven't gotten any warnings when I did the same (or were you saying you put the fog light in somewhere else). Wattage (resistance) could be the issue, as it may go by resistance. I get beeped at every 10 times I start the car for a blown front fog, even when I don't have them on (never now) and they don't turn on to test... Honestly I don't know what metric the car uses to test the bulb. I'd call the stealership and just ask for a part name for the rear fog light bulb. If they won't give it to you, try a different dealership, hell try one in a different state. Dealership customer service is night and day depending on where you go...