Hello,

I no longer have a book for my audi quattro A6 2001. I have a warning light.. a solid circle with parenthesis type markson both sides. (O) The circle is filled in. Please advise as to what that might indicate. Thank you! Jana4444

(O) is a brake pad warning light.
apparently you need new pads and maybe rotors.
my source was google and it is my best friend

http://answers.yahoo.com/question/in...Dxd&show=7

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01:4Runner:Supercharged:Sport Package
96:A6qAvant:Mud Demon
08:SchickTitatniumQuattro:Closest Shave I Ever Gave

Either that, or the sensor wires have a corroded/broken connection.

Bascially it's a wear sensor for your pads (front only)

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