I had to replace both of my upstream sensors over the last few months. Neither is what I would call "easy" to get to. At first I had an error for the bank 2 sensor. I replaced it and everything was fine for about a month. Then I got a code that the bank 1 upstream sensor was "unplugged". I think this just means it's not working. Once I replaced the bank 1 sensor, the car ran so much better. The sensor that was replaced was black as coal and looked like it was plugged up. I can see why it wasn't working properly. Things are great now though.
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2013 Audi TT RS (Tech Pkg, Sport Exhaust, Heated Seats, Sirius)
Retired--2007 Z4 M Coupe (Imola Red/Black, Premium Pkg, Heated Seats, XM, Bimmian stubby antenna, CDV delete, Apex EC-7--Anthracite, Goodyear F1 Asymetric 2.
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