The 4-wire narrow-band oxygen sensor is a replacement sensor for select 2006-2018 Audi, Porsche 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 350-34365 Oxygen Sensor Features:

• Fits 2007-2010 Audi Q7; 2008-2010 Audi A3, Porsche Cayenne, Volkswagen GTI; 2010 Audi A3 Quattro; 2011-2014 Audi A5, A8 Quattro; 2006-2010 Volkswagen Passat
• Fits 2007-2016 Volkswagen Touareg; 2008-2018 Volkswagen Jetta; 2009-2010 Volkswagen CC; 2009-2012 Volkswagen Passat CC
• Sensor location by application: B1S2 (bank and sensor number)
• Used in the center positions, depending on application
• 4-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 800 mm (31.5 in.) overall length
• Male rectangle connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue