The 1-wire narrow-band oxygen sensor is a replacement sensor for select 1980-2003 Chevy, Mercedes-Benz and Nissan applications in the upstream position. It signals whether the exhaust is running rich or lean so the engine computer can trim fuel delivery.

Walker Products 350-31200 Oxygen Sensor Features:

• Fits 1991-1994 Chevy S10 Blazer; 1996-2003 Chevy Chevy; 1980-1981 Mercedes-Benz 280CE, 280E; 1980 Mercedes-Benz 280SE, 450SEL, 450SL; 1981-1983 Mercedes-Benz 380SEL
• Fits 1981-1985 Mercedes-Benz 380SL; 1981 Mercedes-Benz 380SLC; 1984-1985 Mercedes-Benz 380SE, 500SEC, 500SEL; 1983-1986 Nissan 720; 1985-1995 Nissan Pickup
• Fits 2000 Nissan Sentra
• Sensor location by application: B1S1 (bank and sensor number)
• 1-wire narrow-band oxygen sensor
• Unheated design
• M18x1.5 threaded mounting with a 22 mm hex, 210 mm (8.3 in.) overall length
• Lead wire connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue