The 4-wire narrow-band oxygen sensor is a replacement sensor for select 2012-2023 Infiniti and Nissan applications in the downstream 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 250-241104 Oxygen Sensor Features:

• Fits 2012-2013 Infiniti M35h; 2014-2018 Infiniti Q50, Q70; 2012-2023 Nissan March; 2012-2019 Nissan Versa; 2013-2017 Nissan Tiida; 2014-2017 Nissan Versa Note
• Fits 2015-2017 Nissan Note
• Engine coverage includes 1.6L I4, 3.5L V6 applications
• Sensor location by application: B1S2 (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, 375 mm (14.8 in.) overall length
• Female square connector at the harness end with 4 terminal terminals
• Platinum electrode layer with a protective coating against combustion residue