The 1-wire narrow-band oxygen sensor is a replacement sensor for 1990 Ram 50 and Mitsubishi Mighty Max with the 2.4L 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 350-31019 Oxygen Sensor Features:

• Fits 1990 Ram 50, Mitsubishi Mighty Max with the 2.4L I4 engine
• Sensor location by application: B1S1 (bank and sensor number)
• For non-California emissions vehicles
• 1-wire narrow-band oxygen sensor
• Unheated design
• M18x1.5 threaded mounting with a 22 mm hex, 450 mm (17.7 in.) overall length
• Female circle connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue