Walker 250-25088 Oxygen Sensor - Downstream or Upstream

Overview of Walker 250-25088 Oxygen Sensor for Mercedes-Benz

The Walker 250-25088 oxygen sensor is designed specifically for select Mercedes-Benz models, including GL350, GLS350d, ML350, R350, and Sprinter series vehicles. This heated oxygen sensor ensures accurate emission control and optimal engine performance by monitoring exhaust gases effectively.

• Heated oxygen sensor with 5-wire configuration
• Specific fit for Mercedes-Benz GL350, GLS350d, ML350, R350, and Sprinter 1500/2500/3500/3500XD
• Threaded mounting type with 18.0 mm thread diameter
• Radiused polygon male connector for secure wiring harness connection
• Wiring harness length of 10.55 inches and overall length of 14.09 inches
• Wire gauge measurement of 20 for reliable electrical performance

Walker Products OE Line and Part Details

This oxygen sensor is part of the Walker Products OE line, which focuses on delivering original equipment quality components tailored to specific vehicle applications. The 250-25088 sensor meets precise OEM specifications, ensuring compatibility and performance for Mercedes-Benz emission systems. The OE line emphasizes exact fitment and durability, making it suitable for maintaining factory-level emission control standards.

Technical Description and Features

The Walker 250-25088 oxygen sensor features a heated sensor element that allows for quicker activation and more accurate readings under various operating conditions. Its 5-wire design supports both sensor heating and signal transmission, improving responsiveness and reliability. The sensor’s radiused polygon male connector ensures a secure and precise connection to the vehicle’s wiring harness, reducing the risk of electrical faults. With a threaded mounting type and an 18.0 mm thread diameter, installation aligns with factory specifications for a secure fit. The wiring harness length of 10.55 inches and overall length of 14.09 inches provide adequate reach and positioning within the exhaust system.

Common Applications and Problem Resolution

• Restores accurate air-fuel ratio readings for Mercedes-Benz GL350 and GLS350d models
• Resolves check engine light issues related to oxygen sensor faults in ML350 and R350 vehicles
• Improves emission control performance in Sprinter 1500, 2500, 3500, and 3500XD vans
• Addresses rough idling or poor fuel economy caused by faulty oxygen sensors
• Supports compliance with emission regulations by maintaining sensor accuracy

Installation Notes and Tips

When installing the Walker 250-25088 oxygen sensor, ensure the vehicle is cool to avoid burns. Use appropriate tools to remove the old sensor and avoid damaging the threaded mounting hole. Confirm the connector’s radiused polygon shape and male gender match the vehicle’s wiring harness for proper connection. Tighten the sensor to the manufacturer’s torque specifications to prevent exhaust leaks. It is recommended to inspect wiring and connectors for damage before installation.

Quality Assurance and Warranty

Walker Products OE oxygen sensors are manufactured to meet or exceed OEM standards, providing reliable performance and durability. The 250-25088 part number undergoes rigorous quality control to ensure consistent operation within Mercedes-Benz emission systems. While specific warranty details may vary, Walker typically offers coverage against defects in materials and workmanship, supporting long-term vehicle emission compliance.