The 1-wire narrow-band oxygen sensor is a replacement sensor for 1991-1992 Saturn SC, 1991-1994 Saturn SL, SL1, SL2, 1993-1994 Saturn SC1, SC2, SW1 and SW2 with the 1.9L I4 engine in the upstream position. It signals whether the exhaust is running rich or lean so the engine computer can trim fuel delivery.

Walker Products 350-31030 Oxygen Sensor Features:

• Fits 1991-1992 Saturn SC; 1991-1994 Saturn SL, SL1, SL2; 1993-1994 Saturn SC1, SC2, SW1, SW2 with the 1.9L I4 engine
• Sensor location by application: B1S1 (bank and sensor number)
• 1-wire narrow-band oxygen sensor
• Unheated design
• M14x1.5 threaded mounting with a 19 mm hex, 130 mm (5.1 in.) overall length
• Female circle connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue