The 4-wire narrow-band oxygen sensor is a replacement sensor for select 2018-2026 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 250-241255 Oxygen Sensor Features:

• Fits 2019-2025 Infiniti QX50, Nissan Versa; 2022-2025 Infiniti QX55; 2018-2024 Nissan Kicks; 2018-2019 Nissan Versa Note; 2019-2026 Nissan Altima; 2020 Nissan Pathfinder
• Fits 2020-2025 Nissan Sentra; 2020-2024 Nissan TITAN, TITAN XD; 2025 Nissan Kicks Play
• Engine coverage includes 1.6L I4, 2.0L I4, 2.5L I4, 3.5L V6, 5.6L V8 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
• Female rectangle connector at the harness end with 4 spade terminals
• Platinum electrode layer with a protective coating against combustion residue