Walker 250-241177 Oxygen Sensor - Downstream

OE Downstream Oxygen Sensor for Toyota, Mazda, and Scion

Walker Products OE 250-241177 is a heated oxygen sensor built for specific downstream applications and ECU feedback requirements. It is engineered as an OE-style replacement for select Toyota Yaris, Mazda CX-3, Mazda MX-5 Miata, Mazda MX-5, Toyota Yaris iA, and Scion iA models.

With a threaded mounting design, 4-wire heated construction, and a female radiused-polygon connector, this sensor is specified for direct-fit downstream service where accurate exhaust monitoring is needed.

Key Features

• Walker Products OE line oxygen sensor for specific vehicle applications
• Part number 250-241177
• Heated sensor design for faster operating response
• 4-wire configuration with 20-gauge wiring
• Threaded mount with 18.0 mm thread diameter
• 12.59 in. wiring harness length and 15.74 in. overall length
• Female radiused-polygon connector for application-specific fitment
• Downstream position coverage for select bank 1 sensor 2 applications

Product Details

Walker Products OE focuses on original-equipment-style replacement sensors built for specific fitment positions and ECU feedback needs. The 250-241177 oxygen sensor is intended for downstream use on select 2015-2019 Toyota Yaris, 2016-2018 Mazda CX-3, 2016-2018 Mazda MX-5 Miata, 2016-2017 Mazda MX-5, 2017-2018 Toyota Yaris iA, and 2016 Scion iA applications. For buyers searching for a downstream oxygen sensor for Toyota Yaris or a Mazda CX-3 bank 1 sensor 2 replacement, this part number is a direct-fit option for the listed vehicles.

This part cross-references no listed interchange numbers in the provided data.

Common Issues This Sensor May Address

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

Installation Notes and Tips

Confirm the exact year, make, model, and downstream position before ordering. This sensor is specific-fit, so connector shape, wire count, and thread size should be matched to the original part. Inspect the sensor wiring harness and connector for damage during diagnosis, since physical wear can shorten service life and affect signal quality.

Quality Assurance

Walker Products has supplied engine management and oxygen/air-fuel sensors since 1946 and manufactures OE-style replacement parts for specific applications. The brand operates under Automotive ISO9001/TS 16949 certification, with production focused on application-specific fitment and ECU feedback requirements.