The 4-wire narrow-band oxygen sensor is a replacement sensor for 2019-2021 Mazda CX-3, 2019-2023 Mazda MX-5, 2019-2025 Mazda MX-5 Miata and 2020-2023 Mazda 2 in the downstream position. It signals whether the exhaust is running rich or lean so the engine computer can trim fuel delivery. A built-in heater brings the element to operating temperature quickly after a cold start.

Walker Products 350-341118 Oxygen Sensor Features:

• Fits 2019-2021 Mazda CX-3; 2019-2023 Mazda MX-5; 2019-2025 Mazda MX-5 Miata; 2020-2023 Mazda 2
• Engine coverage includes 1.5L I4, 2.0L I4 applications
• Sensor location by application: B1S2 (bank and sensor number)
• 4-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 458 mm (18 in.) overall length
• 425 mm (16.7 in.) wiring harness
• Male square connector at the harness end with 4 spade terminals
• Platinum electrode layer with a protective coating against combustion residue