Oxygen Sensor for 2019-2022 Mazda 3 & More - Walker 250-241278

Walker Products 250-241278 oxygen sensor for the 2019-2022 Mazda 3 4-cylinder 2.5L, the 2021-2022 3 4-cylinder 2.0L and other vehicles measures the oxygen in the exhaust gas to show how efficiently the engine burns fuel. This downstream sensor gives the ECU the diagnostic feedback its application calls for.

• Narrow-band design with 4 wires, made for its specific application and fitment position
• Electrodes made of a gas-permeable platinum layer
• Electrode coating prevents contamination and erosion of the electrode surfaces by combustion residue and particulates in the exhaust gases
• Measures oxygen levels to help fine-tune the air-fuel mixture
• Monitors exhaust gases to help reduce pollutants

Quick facts

• Part: Walker Products 250-241278 oxygen sensor
• Fits: the 2019-2022 Mazda 3 4-cylinder 2.5L, the 2021-2022 3 4-cylinder 2.0L and other vehicles
• Position: Downstream
• Condition: New

A failing oxygen sensor might show up as rough running, higher fuel consumption, more exhaust emissions or a lit malfunction indicator light. Before replacing it, look over the sensor's wiring harness and connector for physical damage with the engine off and cool; a shop can read any fault codes stored in the ECU.

Fits

The 2017-2025 Mazda CX-5 4-cylinder 2.5L and the 2018-2021 Mazda 6 4-cylinder 2.5L are among the vehicles this oxygen sensor fits. This listing is one direct-fit sensor, and the downstream position takes just one. If your car is not named here, open the "Vehicles it fits" section and look up your exact model and engine.

Specifications

Product information is for general reference and may contain errors. See our Disclaimer.