The air/fuel ratio sensor installs in the upstream position on select 2018-2026 Lexus 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 350-64112 Air/Fuel Ratio Sensor Features:

• Fits 2019-2025 Lexus ES300h, Toyota RAV4; 2021-2025 Lexus ES250; 2022-2025 Lexus NX250; 2022-2023 Lexus NX350h; 2022-2026 Lexus NX450h+; 2018-2024 Toyota Camry
• Fits 2019-2022 Toyota Avalon; 2021-2024 Toyota RAV4 Prime, Venza with the 2.5L I4 engine
• 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, 550 mm (21.7 in.) overall length
• 575 mm (22.6 in.) wiring harness
• Female square connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue