Walker 250-241298 Oxygen Sensor - Downstream

OE Base Oxygen Sensor for Hyundai Tucson

Walker OE Base Sensor 250-241298 is a specific-fit, heated narrow-band oxygen sensor engineered for the downstream position on select Hyundai Tucson models. It is built to provide the ECU with the exhaust feedback needed for accurate fuel control and emissions monitoring.

Fits 2019-2021 Hyundai Tucson, downstream. This Walker oxygen sensor is identified by part number 250-241298 and is intended for the B1S2 application on the Hyundai Tucson platform.

Key Features

• Specific-fit oxygen sensor for the downstream location
• Heated narrow-band design for exhaust feedback monitoring
• 4-wire configuration with square female connector
• Spade terminals, 4 terminal count
• M18 x 1.5 thread size with 22 mm wrench size
• OE Base Sensor line from Walker Products

Product Details

Walker Products OE Base Sensor line focuses on direct replacement engine management sensors built for the exact application and connector style required by the vehicle. Part number 250-241298 is made for 2019-2021 Hyundai Tucson downstream use, where the oxygen sensor helps the ECU monitor exhaust oxygen content and adjust engine operation accordingly. When the sensor signal becomes inaccurate, the vehicle may run poorly, use more fuel, increase emissions, or trigger the malfunction indicator light. The sensor, wiring harness, and connector should also be inspected for damage during diagnosis. This part cross-references Monroe Shocks & Struts (e.g., 172286) for the same application.

Common Issues This Sensor May Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect fuel mixture feedback from the exhaust system
• Reduced fuel economy caused by faulty sensor readings
• Higher exhaust emissions from inaccurate ECU input
• Poor drivability tied to oxygen sensor signal loss

Installation Notes and Tips

Confirm the connector shape, terminal count, thread size, and downstream position before installation. On Hyundai Tucson applications, inspect the harness and connector for corrosion, heat damage, or broken terminals before replacing the sensor. Use the correct 22 mm wrench size and verify the M18 x 1.5 thread engagement during installation. Clear diagnostic trouble codes after repair and confirm the ECU returns to normal sensor feedback.

Quality Assurance

Walker Products has been producing engine management and fuel system components since 1946 and operates as an ISO 9001/TS 16949 certified company. The OE Base Sensor line is built around application-specific fitment and diagnostic feedback requirements for modern vehicle systems.