$51
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O2 upstream oxygen sensor for Audi R8, A6 Quattro, A8, and RS4. Compatible with 2005-2006 A6 Quattro Base (BNK), 2007-2011 A6 Quattro Base (BVJ), 2007-2008 RS4 Base (BNS), and 2008 RS4 Cabriolet (BNS). Evan-Fischer Oxygen Sensor. Suitable for listed vehicles in the description.