Walker 250-25091 Oxygen Sensor - Downstream or Upstream

Overview of Walker Products OE Oxygen Sensor 250-25091

The Walker Products OE Oxygen Sensor 250-25091 is designed specifically for select Mercedes-Benz models, including the E350 and Sprinter series. This heated oxygen sensor ensures accurate emissions control and optimal engine performance by providing precise air-fuel mixture data.

• Heated oxygen sensor with 5-wire configuration
• Specific fit for Mercedes-Benz E350, Sprinter 2500, Sprinter 3500, and Sprinter 3500XD
• 19.21-inch wiring harness length for flexible installation
• Threaded mounting type with 18.0 mm thread diameter
• Radiused polygon male connector for secure connection
• Wire gauge measurement of 20 for reliable signal transmission
• Overall length of 22.76 inches for proper fitment

Detailed Product Description

The Walker Products OE line focuses on delivering original equipment quality parts that meet or exceed factory specifications. The 250-25091 oxygen sensor is a heated sensor designed to provide fast response times and accurate readings critical for emission control systems. Its 5-wire design includes a heating element that allows the sensor to reach operating temperature quickly, improving fuel efficiency and reducing emissions. The sensor features a radiused polygon male connector, ensuring a secure and precise fit with the vehicle’s wiring harness. With a wiring harness length of 19.21 inches and an overall length of 22.76 inches, this sensor is engineered for a specific fitment on Mercedes-Benz E350 and Sprinter models, guaranteeing compatibility and ease of installation.

Common Applications and Issues Addressed

• Restores accurate oxygen sensing for proper air-fuel mixture control
• Helps resolve rough idling and engine hesitation
• Reduces increased fuel consumption caused by faulty sensors
• Prevents emission test failures due to sensor malfunction
• Eliminates check engine light codes related to oxygen sensor faults

Installation Notes and Tips

Installation of the Walker 250-25091 oxygen sensor requires removal of the old sensor from the threaded mounting point. Ensure the connector matches the radiused polygon male design for proper connection. The 19.21-inch wiring harness length provides flexibility during installation, but care should be taken to avoid wire damage. Use appropriate tools to avoid damaging the 18.0 mm thread diameter during removal or installation. It is recommended to check for any exhaust leaks and clean the mounting area before installing the new sensor.

Quality Assurance and Warranty

Walker Products OE parts are manufactured to meet original equipment standards, ensuring reliable performance and durability. The 250-25091 oxygen sensor undergoes rigorous testing to comply with emission control requirements. 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.