The air/fuel ratio sensor installs in the upstream position on select 2013-2022 Infiniti and Nissan applications. It reports the exhaust air-fuel ratio so the engine computer can meter fuel precisely. A built-in heater brings the element to operating temperature quickly after a cold start.

Walker Products 350-64086 Air/Fuel Ratio Sensor Features:

• Fits 2014-2019 Infiniti Q50, Q70; 2015 Infiniti Q40, Nissan Xterra; 2015-2016 Infiniti Q60; 2015-2019 Infiniti Q70L, QX70, Nissan Frontier, Murano, Pathfinder
• Fits 2015-2017 Infiniti QX50, Nissan Quest; 2015-2020 Infiniti QX60, QX80, Nissan 370Z; 2013-2017 Nissan Sentra; 2015-2018 Nissan Altima; 2015-2021 Nissan Maxima
• Also fits select Infiniti and Nissan applications
• Sensor location by application: B1S1 (bank and sensor number)
• 4-wire wide-band air/fuel ratio sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 500 mm (19.7 in.) overall length
• Male rectangle connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue