Hey, My check engine light had been going off and on for two weeks so I made an appointment with the dealership to find out whats wrong. (I have a warranty that covers diagnostics) When they were done they said that the front O2 sensor was going bad, It was running rich, and that my brake pads were getting low. They said the brake pads had a string/wire in them that was connected to a sensor and when it was broke it would trip the sensor. I've never heard this so I feel its kinda odd. I was at the shop on thursday and the check engine light has not came back on since.

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1997 Audi A4 Quattro 2.8 Manual, Intake

the " string wire lol " thats a new one, its a low pads sensor wire which wares out when the pads are low which is what its designed to do as for the CEL let them check it out