Walker 250-241278 Oxygen Sensor - Downstream

Walker OE Oxygen Sensor for Mazda

Walker Products OE oxygen sensor Part Number 250-241278 is an OE-style replacement built for specific downstream applications. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions monitoring on supported Mazda vehicles.

Key Features

• Walker Products OE line oxygen sensor for emission control systems
• Downstream sensor placement for the listed Mazda applications
• Built for application-specific fitment and ECU feedback
• Supports accurate exhaust monitoring on vehicles with fault-code diagnostics
• Walker Products Part Number 250-241278

Application Details

This oxygen sensor is designed for Mazda CX-5, Mazda 3, Mazda CX-30, Mazda 6, and Mazda CX-9 models with downstream fitment. It covers 2016-2025 model years across the listed applications, including Fits 2022-2025 Mazda CX-5, Downstream; Fits 2017 Mazda CX-5, Downstream; Fits 2019-2022 Mazda 3, Downstream; Fits 2021-2022 Mazda CX-30, Downstream; Fits 2018-2021 Mazda 6, Downstream; Fits 2018-2021 Mazda CX-5, Downstream; Fits 2020 Mazda CX-30, Downstream; and Fits 2016-2018 Mazda CX-9, Downstream. For downstream bank 1 sensor 2 applications, verify the exact vehicle configuration before ordering. Part Number 250-241278 is listed for these OE base sensor positions.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor engine operation caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel monitoring
• Higher exhaust emissions from a failing downstream sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes

Confirm the downstream location and match the vehicle’s sensor position before installation. Inspect the sensor wiring harness and connector for damage, since physical wear can shorten service life and affect signal quality. On Mazda CX-5, Mazda 3, Mazda CX-30, Mazda 6, and Mazda CX-9 applications, verify the exact engine and sensor placement against the vehicle’s diagnostic information.

Quality Assurance

Walker Products OE sensors are developed as original-equipment replacement parts for specific vehicle applications. The brand is ISO 9001 and TS 16949 certified, and its engine management sensor line is built around application-specific fitment and ECU feedback requirements. Walker Products has supplied engine management and fuel system components since 1946.