The 3-wire narrow-band oxygen sensor is a replacement sensor for select 1985-1998 Audi, Ferrari, Saab and Volvo 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 350-33059 Oxygen Sensor Features:

• Fits 1993-1994 Audi 100, 100 Quattro; 1993-1995 Audi 90, 90 Quattro; 1994-1998 Audi Cabriolet; 1995-1997 Audi A6, A6 Quattro; 1986-1989 Ferrari 328 GTS
• Fits 1988 Ferrari Mondial 3.2, Saab 900; 1987-1989 Saab 9000; 1985-1988 Volvo 244, 245, 740; 1985 Volvo 745
• Engine coverage includes 2.0L I4, 2.3L I4, 2.4L I6, 2.8L V6, 3.2L V8 applications
• Sensor location by application: B1S1 (bank and sensor number)
• Used in both upstream and downstream positions, depending on application
• 3-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 710 mm (28 in.) overall length
• Male rectangle connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue