Walker 250-241294 Oxygen Sensor - Downstream or Downstream Right

Walker OE Base Oxygen Sensor 250-241294

Walker OE Base Sensor 250-241294 is a specific-fit, heated narrow-band oxygen sensor built for downstream applications on select BMW models. It is engineered as an OE-style replacement to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions monitoring.

For BMW 230i, 330i, X3, X5, and other listed applications, this sensor is matched to the vehicle position and connector style for direct replacement service. Walker Products has supplied engine management sensors since 1946, and the OE Base Sensor line focuses on application-specific fitment for modern emissions systems.

Key Features

• Part number: 250-241294
• Heated narrow-band oxygen sensor
• Specific fit for listed BMW downstream locations
• 4-wire design with oblong female connector
• 4 terminals, male terminal gender
• M18 x 1.5 thread size with 22 mm wrench size
• OE Base Sensor line for application-specific replacement

Detailed Description

Walker 250-241294 is an oxygen sensor for downstream use on select BMW vehicles, including BMW 230i, 330i, 430i, X3, X4, X5, X6, X7, Z4, 530i, 530e, and related models listed in the fitment data. It is a heated narrow-band sensor with a specific-fit design, so the connector, terminal layout, and thread specification are matched to the intended application. This helps the ECU receive the feedback needed for emissions system monitoring and fuel-trim control.

The OE Base Sensor product line is built around direct replacement fitment rather than universal coverage. That makes it a practical choice when replacing a downstream oxygen sensor on BMW applications where the original sensor has triggered a fault code, illuminated the MIL, or contributed to poor engine performance or increased fuel consumption. Part number 250-241294 is also a useful reference when searching for a BMW downstream oxygen sensor replacement by application.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Fault codes stored in the ECU for emissions monitoring
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation tied to sensor signal issues
• Elevated exhaust emissions from a failing oxygen sensor

Installation Notes and Tips

Verify the vehicle year, model, and sensor position before installation. This sensor is listed for downstream locations only, including downstream right on certain BMW applications. Inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals before replacement, since physical damage can shorten sensor life and affect operation.

Confirm thread size, connector shape, and terminal count against the original part before installation. For BMW downstream oxygen sensor replacement service, matching the OE-style connector and application-specific position is important for proper ECU feedback.

Quality Assurance

Walker Products manufactures engine management and oxygen/air-fuel sensors as OE replacement parts for global vehicle applications. The company is ISO 9001/TS 16949 certified and has produced automotive sensors and fuel system components since 1946.