Walker 250-24143 Oxygen Sensor - Upstream or Upstream Left

Overview of Walker Products OE Oxygen Sensor 250-24143

The Walker Products OE Oxygen Sensor 250-24143 is designed specifically for select BMW and Mercedes-Benz models, including the C43 AMG, C280, CLK320, CLK430, M3, SL500, and Z3. This heated oxygen sensor ensures accurate emissions control and optimal engine performance by providing precise air-fuel mixture data.

• Heated oxygen sensor with 4-wire design for reliable operation
• Specific fit for BMW and Mercedes-Benz vehicles
• 29.84-inch wiring harness length for flexible installation
• Threaded mounting type with 18.0 mm thread diameter
• Radiused polygon male connector for secure electrical connection
• Wire gauge measurement of 20 for durability and signal integrity
• Overall length of 33.39 inches to accommodate factory fitment

Detailed Product Description

The Walker Products OE line focuses on providing original equipment quality parts that meet or exceed OEM specifications. The 250-24143 oxygen sensor is a heated sensor, which allows it to reach operating temperature quickly, improving emissions control and fuel efficiency. Its 4-wire configuration includes two wires for the heater circuit and two for the sensor signal, ensuring accurate and consistent readings. The sensor’s 29.84-inch wiring harness and radiused polygon male connector are designed for a precise fit in the specified BMW and Mercedes-Benz models, reducing installation time and potential wiring issues. The threaded mounting type with an 18.0 mm diameter ensures secure attachment to the exhaust system, maintaining sensor stability under various driving conditions.

Compatible Vehicles and Applications

This oxygen sensor is compatible with the following vehicles:

• BMW M3 and Z3 models
• Mercedes-Benz C43 AMG, C280, CLK320, CLK430, and SL500

It is engineered to replace factory sensors in these models, helping to maintain proper emissions control and engine management system performance.

Common Issues Addressed by Oxygen Sensor 250-24143

• Check engine light triggered by faulty oxygen sensor readings
• Poor fuel economy due to incorrect air-fuel mixture data
• Increased emissions and failed emissions tests
• Engine hesitation or rough idling caused by sensor malfunction
• Reduced engine performance and drivability problems

Installation Notes and Tips

When installing the Walker Products OE oxygen sensor 250-24143, 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 type matches the factory harness—this sensor features a radiused polygon male connector. Thread the sensor carefully into the exhaust bung to the specified torque to prevent leaks or damage. It is recommended to inspect the wiring and connector for corrosion or damage before installation.

Quality Assurance and Warranty

Walker Products OE parts are manufactured to meet strict OEM standards, ensuring reliable performance and durability. The 250-24143 oxygen sensor undergoes rigorous testing to confirm fitment and function for the specified BMW and Mercedes-Benz models. While specific warranty details may vary, Walker typically offers coverage against defects in materials and workmanship, providing confidence in the sensor’s long-term operation.