The 4-wire narrow-band oxygen sensor is a replacement sensor for select 1995-2010 Audi 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 350-34427 Oxygen Sensor Features:

• Fits 1997-1999 Audi A4, A8, A8 Quattro; 1997-2000 Audi A4 Quattro, Volkswagen EuroVan; 1998-1999 Audi A6, A6 Quattro; 1995-1998 Volkswagen Golf
• Fits 1995-1999 Volkswagen Jetta; 1996-2000 Volkswagen Passat; 1998-2009 Volkswagen Pointer; 1998-2010 Volkswagen Pointer Truck
• Engine coverage includes 1.8L I4, 2.0L I4, 2.8L V6, 3.7L V8, 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, 740 mm (29.1 in.) overall length
• Male rectangle connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue