Walker 250-25048 Oxygen Sensor - Downstream, Upstream or Upstream Left

Overview of Walker Products OE Oxygen Sensor 250-25048

The Walker Products OE Oxygen Sensor 250-25048 is designed specifically for select BMW and Mercedes-Benz models, including the 535i, 535i xDrive, 740i, 740Li, CLK63 AMG, E320, and X6. This heated oxygen sensor ensures accurate emission control and optimal engine performance by monitoring exhaust gases effectively.

• Heated oxygen sensor with 5-wire configuration
• Wiring harness length of 48.74 inches for flexible installation
• Threaded mounting type with 18.0 mm thread diameter
• Radiused polygon male connector for secure fit
• Overall length of 52.28 inches
• Wire gauge measurement of 20 for reliable signal transmission
• Specific fit for BMW and Mercedes-Benz models

Walker Products OE Brand Line Details

The Walker Products OE line focuses on delivering original equipment quality emission control components. This oxygen sensor, part number 250-25048, meets strict OE standards to ensure compatibility and performance consistent with factory-installed parts. The product line emphasizes precise fitment and durability, making it suitable for professional repairs and maintenance on BMW and Mercedes-Benz vehicles.

Technical Description and Features

This oxygen sensor features a heated sensor type that allows for quicker warm-up times and more accurate readings under various operating conditions. The 5-wire design supports both sensor heating and signal output, improving responsiveness and reliability. The radiused polygon male connector ensures a secure electrical connection, reducing the risk of signal loss or corrosion. With a wiring harness length of 48.74 inches and an overall length of 52.28 inches, this sensor provides ample reach for installation in the exhaust system. The threaded mounting type with an 18.0 mm diameter allows for straightforward replacement in compatible BMW and Mercedes-Benz models.

Applications and Problem Resolution

• Restores accurate air-fuel mixture readings for improved engine efficiency
• Helps resolve check engine light issues related to oxygen sensor faults
• Reduces emissions by ensuring proper catalytic converter function
• Prevents rough idling and poor fuel economy caused by faulty sensors
• Supports emission compliance for BMW 535i, 740i, CLK63 AMG, and other specified models

Installation Notes and Tips

When installing the Walker Products OE oxygen sensor 250-25048, ensure the vehicle is cool to avoid burns. Use appropriate tools to remove the old sensor and avoid damaging the wiring harness. Verify the connector shape and gender match the vehicle’s harness before installation. Thread the sensor carefully to prevent cross-threading and tighten to manufacturer torque specifications. Testing the sensor after installation can confirm proper operation and emission system function.

Quality Assurance and Warranty

Walker Products OE oxygen sensors are manufactured to meet or exceed original equipment standards. This part number 250-25048 undergoes rigorous quality control to ensure durability and reliable performance. While specific warranty details may vary, Walker typically offers coverage against defects in materials and workmanship, providing confidence in the sensor’s long-term functionality for BMW and Mercedes-Benz applications.