This 4-wire wide-band air/fuel ratio sensor fits select 2011-2024 Lexus, Scion, Subaru and Toyota applications in the upstream position and 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 350-64031 Air/Fuel Ratio Sensor Features:

• Fits 2011-2015 Lexus RX450h; 2013-2018 Lexus ES300h, ES350, Toyota Avalon, RAV4; 2013-2015 Lexus RX350, Subaru XV Crosstrek; 2011-2016 Scion tC, Toyota Highlander
• Fits 2013-2016 Scion FR-S, Subaru XV, Toyota Tacoma; 2012-2024 Subaru Impreza; 2013-2020 Subaru BRZ; 2013-2024 Subaru Forester; 2013-2019 Subaru Legacy, Outback
• Also fits select Lexus, Scion, Subaru 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, 425 mm (16.7 in.) overall length
• Male square connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue