The oxygen sensor installs on select 1998-2015 Audi, 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 350-34340 Oxygen Sensor Features:

• Fits 1998-2000 Audi A3; 1999 Audi TT; 2001-2005 Seat Toledo; 2002-2007 Seat Alhambra; 1998-2004 Volkswagen Beetle; 1999-2006 Volkswagen Golf; 1999-2001 Volkswagen Jetta
• Fits 2002-2008 Volkswagen Sharan; 2004-2006 Volkswagen Phaeton; 2009-2013 Volkswagen Gol; 2010-2013 Volkswagen Saveiro; 2011-2015 Volkswagen Clasico
• Engine coverage includes 1.6L I4, 1.8L I4, 2.0L I4, 2.8L V6, 4.2L V8 applications
• Sensor locations by application: B1S1, B1S2 (bank and sensor number)
• Used in both upstream and downstream 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, 1100 mm (43.3 in.) overall length
• Male square connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue