The 4-wire narrow-band oxygen sensor is a replacement sensor for 1999-2001 Land Rover Freelander with the 1.8L I4 engine in the upstream position. 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 350-34871 Oxygen Sensor Features:

• Fits 1999-2001 Land Rover Freelander with the 1.8L I4 engine
• Sensor location by application: B1S1 (bank and sensor number)
• 4-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 620 mm (24.4 in.) overall length
• Female rectangle connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue