The air/fuel ratio sensor installs in the upstream position on select 2010-2026 Lexus, Scion and Toyota 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 350-64073 Air/Fuel Ratio Sensor Features:

• Fits 2011-2017 Lexus CT200h; 2013-2014 Lexus ES350, Toyota FJ Cruiser; 2013-2020 Lexus GS350; 2013-2018 Lexus GS450h; 2013-2015 Lexus IS250, Toyota 4Runner
• Fits 2013-2025 Lexus IS350; 2014-2017 Lexus LS460; 2015-2017 Lexus NX200t; 2015-2025 Lexus RC350; 2016-2025 Lexus IS300, RC300; 2016 Lexus LS600h
• Also fits select Lexus, Scion and Toyota 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, 375 mm (14.8 in.) overall length
• Male square connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue