The 4-wire narrow-band oxygen sensor is a replacement sensor for 2000-2001 Audi S3, 2001-2002 Audi TT Quattro, 2003-2008 Seat Cordoba, 2004-2009 Seat Ibiza and 2003-2004 Volkswagen R32. 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 350-34429 Oxygen Sensor Features:

• Fits 2000-2001 Audi S3; 2001-2002 Audi TT Quattro; 2003-2008 Seat Cordoba; 2004-2009 Seat Ibiza; 2003-2004 Volkswagen R32
• Engine coverage includes 1.6L I4, 1.8L I4, 3.2L V6 applications
• Sensor location by application: B1S1 (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, 350 mm (13.8 in.) overall length
• Male/female oblong connector at the harness end with 4 spade terminals
• Platinum electrode layer with a protective coating against combustion residue