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Facet Rear Oxygen (O2) Sensor for 2008-2011 Audi R8 4.2L 5.2L V10 V8. This Facet Oxygen Sensor fits the rear position on 2011, 2010, 2009, and 2008 Audi R8 models with 4.2L and 5.2L V10 V8 engines. Ideal for a tune up or performance upgrade, this O2 sensor is a direct fit replacement for your Audi R8 rear oxygen sensor needs.