The oxygen sensor installs in the downstream position on select 2003-2009 Audi, Bentley, Seat and Volkswagen applications. It signals whether the exhaust is running rich or lean so the engine computer can trim fuel delivery. A built-in heater brings the element to operating temperature quickly after a cold start.

Walker Products 350-34194 Oxygen Sensor Features:

• Fits 2003 Audi Allroad Quattro, Bentley Continental; 2005-2009 Audi A8 Quattro; 2003-2007 Seat Cordoba; 2005-2008 Seat Ibiza; 2003-2004 Volkswagen R32
• Fits 2004-2007 Volkswagen Touareg
• Engine coverage includes 1.8L I4, 2.0L I4, 3.2L V6, 4.2L V8, 6.0L W12 applications
• Sensor location by application: B1S2 (bank and sensor number)
• 4-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 1525 mm (60 in.) overall length
• Male oblong connector at the harness end with 4 spade terminals
• Platinum electrode layer with a protective coating against combustion residue