The oxygen sensor installs in the upstream position on select 2018-2025 Mazda applications. It measures the exhaust air-fuel ratio across a broad range 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 350-35152 Oxygen Sensor Features:

• Fits 2018-2021 Mazda 6; 2018-2025 Mazda CX-5; 2019-2025 Mazda 3; 2019-2023 Mazda CX-3; 2020-2025 Mazda CX-30; 2023 Mazda 2; 2023-2025 Mazda CX-50
• Engine coverage includes 1.5L I4, 2.0L I4, 2.5L I4 applications
• 5-wire wide-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex
• 715 mm (28.1 in.) wiring harness
• Platinum electrode layer with a protective coating against combustion residue