The 4-wire narrow-band oxygen sensor is a replacement sensor for select 2006-2022 Audi, Seat and Volkswagen applications in the downstream position. 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 350-34585 Oxygen Sensor Features:

• Fits 2008-2016 Audi A5; 2008-2010 Audi A5 Quattro; 2009-2014 Audi A4 Quattro; 2009-2017 Audi Q5; 2010-2012 Audi A4, Seat Altea; 2010-2016 Audi S4; 2010-2017 Audi S5
• Fits 2012 Audi A3; 2012-2015 Audi A6, A7 Quattro; 2013-2014 Audi A8 Quattro; 2014-2017 Audi SQ5; 2006-2009 Seat Cordoba; 2006-2015 Seat Ibiza; 2007-2012 Seat Leon
• Also fits select Audi, Seat and Volkswagen applications
• Sensor locations by application: B1S2, B2S2 (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, 525 mm (20.7 in.) overall length
• Male rectangle connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue