The 4-wire narrow-band oxygen sensor is a replacement sensor for select 1994-2010 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 350-34205 Oxygen Sensor Features:

• Fits 1994-1998 Audi Cabriolet; 1998-1999 Audi A4, Volkswagen Passat; 1998-2000 Audi A4 Quattro; 1997-2000 Volkswagen EuroVan; 2001-2009 Volkswagen Pointer
• Fits 2004-2010 Volkswagen Pointer Truck
• Engine coverage includes 1.8L I4, 2.0L I4, 2.8L 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, 1440 mm (56.7 in.) overall length
• Male oblong connector at the harness end with 4 spade terminals
• Platinum electrode layer with a protective coating against combustion residue