The 1-wire narrow-band oxygen sensor is a replacement sensor for 1986-1987 Mazda B2000 and 1987-1989 Mazda B2200 in the upstream position. It signals whether the exhaust is running rich or lean so the engine computer can trim fuel delivery.

Walker Products 350-31022 Oxygen Sensor Features:

• Fits 1986-1987 Mazda B2000; 1987-1989 Mazda B2200
• Engine coverage includes 2.0L I4, 2.2L I4 applications
• 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, 1000 mm (39.4 in.) overall length
• Female rectangle connector at the harness end with 1 spade terminals
• Platinum electrode layer with a protective coating against combustion residue