The oxygen sensor installs in the downstream position on select 2015-2023 Infiniti and Nissan applications. It signals whether the exhaust is running rich or lean so the engine computer can trim fuel delivery. It uses a male/female rectangle connector with 4 terminals.

Walker Products 250-241151 Oxygen Sensor Features:

• Fits 2015-2020 Infiniti QX60; 2015-2018 Nissan Altima; 2015-2017 Nissan Juke, Quest; 2015-2021 Nissan Maxima; 2015-2019 Nissan Murano, Pathfinder; 2016-2023 Nissan NP300
• Fits 2017-2019 Nissan Rogue, Sentra; 2018-2020 Nissan NP300 Frontier; 2018-2023 Nissan X-Trail
• Engine coverage includes 1.6L I4, 2.0L I4, 2.5L 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, 400 mm (15.7 in.) overall length
• Male/female rectangle connector at the harness end with 4 pin terminals
• Platinum electrode layer with a protective coating against combustion residue