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Let me start at the begining, I have an 06 A6 and had the throttle body and intake ported with a small adjustment/taste of a tune from a reputable tuner. I then added headers and had the o2 rear sensor wire melt. So I left the sensor in pluging the hole and had the rear o2s deleted.
Since particularly the headers install I have been getting a message saying "ACTIVE HANDLING" on my dash then "SERVICE ACTIVE HANDLING" (the car pulls to the side!) to even having the AIRBAG SENSOR light up!!
I have taken it to the dealer and they have replaced both active handling sensors and NOTHING!