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Exhaust Gas Temperature Sensor. Nitrogen Oxides Nox Sensor. Nitrogen Oxide Sensor. Gas Temperature Sensor. A6 3.2L V6 2005 2006 2007 2008 2009. A4 3.2L V6 2005 2006 2007 2008 2009. It is positioned in the exhaust pipe and can detect the ratio of air and gasoline.
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