Walker 250-25123 Oxygen Sensor - Upstream or Upstream Left

Overview of Walker Products OE Oxygen Sensor 250-25123

The Walker Products OE Oxygen Sensor 250-25123 is designed specifically for BMW M2, M3, and M4 models. This heated oxygen sensor features a threaded mounting type and a radiused polygon male connector, ensuring precise fitment and reliable performance in emission control systems.

• Wiring harness length: 29.52 inches
• Wire gauge measurement: 20 gauge
• Heated sensor type for faster response
• Specific fit for BMW M2, M3, and M4
• Five-wire configuration for accurate signal transmission
• Radiused polygon male connector for secure connection
• Thread diameter: 18.0 mm
• Overall length: 33.46 inches
• Threaded mounting type for easy installation

Walker Products OE Brand Line Details

The Walker Products OE line focuses on delivering original equipment quality parts that meet or exceed factory specifications. The 250-25123 oxygen sensor is part of this line, providing a direct replacement solution engineered to maintain the emission control integrity of BMW vehicles. This ensures compatibility and performance consistent with the original sensor installed in BMW M2, M3, and M4 models.

Product Description and Technical Specifications

This oxygen sensor is a heated type, which allows it to reach operating temperature quickly, improving fuel efficiency and reducing emissions. The sensor includes a 29.52-inch wiring harness with 20 gauge wires, arranged in a five-wire configuration to support accurate oxygen level detection. The radiused polygon male connector ensures a secure and precise connection to the vehicle’s wiring system. With an 18.0 mm thread diameter and a threaded mounting type, installation is straightforward and compatible with the designated BMW models. The overall length of 33.46 inches provides sufficient reach for proper placement within the exhaust system.

Common Applications and Issues Addressed

• Restores accurate oxygen sensing for BMW M2, M3, and M4 emission systems
• Helps resolve engine performance issues related to faulty oxygen sensors
• Reduces emissions by ensuring proper air-fuel mixture monitoring
• Prevents check engine light triggers caused by sensor failure
• Improves fuel economy by providing precise feedback to the engine control unit

Installation Notes and Tips

When installing the Walker Products OE oxygen sensor 250-25123, ensure the vehicle is cool to avoid burns. Use appropriate tools to remove the old sensor and avoid damaging the threaded mounting hole. Verify the connector type matches the vehicle harness before installation. Tighten the sensor to the manufacturer’s torque specifications to prevent leaks or damage. It is recommended to inspect wiring and connectors for corrosion or damage during replacement.

Quality Assurance and Warranty

Walker Products OE oxygen sensors are manufactured to meet strict quality standards, ensuring durability and reliable performance. The 250-25123 part undergoes rigorous testing to comply with OEM specifications for BMW M2, M3, and M4 models. Warranty coverage details should be confirmed with the product documentation or supplier, as it may vary by region.