ch0wd0wn

Audi A6 2008 quattro

I got brake light warning for back passenger side. Bought replacement bulbs... open up the back light shell .... none of the bulbs are burnt! All the top 3 bulbs are on when I start the engine to test the brake lights. I step on brakes, the left side lights up (the side I didn't open) ...the right side that I open the 3 lights just stays on..I thought it would flash or light up when I press brakes. If all the bulbs are ok then what else can I check THe brake light warning still showing and still does not light up when I press brake.

Thanks!
C

A6Gary

You should scan the car to see what (if any) diagnostic trouble codes (DTCs) are present to help you resolve the brake warning light.

AudiAllTheWay

Maybe wrong bulbs in sockets like a single filament bulb in a dual filament socket shorting 2 pins etc. Could find a bulb chart or compare bulbs with the working side. If a bulb fits in a hole doesn’t mean it’s correct 😉

jonzie77

Also, check for corrosion at the connector for the assembly. If there is high resistance in a connection then the bulb test will fall outside of a pre-determined range.

alvocado

This is a common issue with the tail light assembly and is a result of connectors failing in the unit. It is not serviceable and you will need to buy a replacement assembly. Fortunately, it comes with new bulbs if I remember correctly but it's been awhile since I replaced mine