Bosch 13257 Oxygen Sensor - Downstream Left or Downstream Right

Reliable Oxygen Sensor for Nissan Pathfinder and Infiniti QX4

The Bosch Actual OE Oxygen Sensor 13257 is designed specifically for Nissan Pathfinder and Infiniti QX4 models. This narrow-band heated oxygen sensor ensures accurate emissions control and optimal engine performance by providing precise air-fuel mixture data to your vehicle's engine management system.

• Brand: Bosch, Part Number: 13257
• Specific fit for Nissan Pathfinder and Infiniti QX4
• Narrow-band heated oxygen sensor with 4-wire design
• Threaded mounting type with 18 mm thread diameter and 22 mm hex size
• Wiring harness length: 47.1 inches with included harness and male square connector
• Durable metal housing finished in steel
• Standard replacement grade for reliable performance

About the Bosch Actual OE Oxygen Sensor Line

The Bosch Actual OE Oxygen Sensor product line focuses on delivering direct-fit replacement sensors that meet original equipment specifications. This ensures compatibility and performance consistency for vehicles like the Nissan Pathfinder and Infiniti QX4. The 13257 sensor is engineered to provide accurate readings and maintain emissions compliance, supporting the vehicle’s fuel efficiency and engine health.

Detailed Product Description

This Bosch oxygen sensor features a narrow-band heated design with four terminals and wires, allowing for quick warm-up and precise measurement of exhaust oxygen levels. The sensor’s threaded mounting type with an 18 mm diameter and 22 mm hex size allows for straightforward installation. The wiring harness, measuring 47.1 inches, includes a male square connector with blade terminals, ensuring a secure and reliable electrical connection. Constructed with a metal housing finished in steel, this sensor is built to withstand harsh engine conditions. The overall length of 50.8 inches and sealing surface to connector length of 49.6 inches provide ample reach for proper fitment in the specified vehicles.

Common Issues Addressed by This Oxygen Sensor

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

Installation Notes and Tips

Ensure the engine is cool before removing the old oxygen sensor to avoid burns. Use a 22 mm oxygen sensor socket for removal and installation. Verify the wiring harness length and connector type match your vehicle’s specifications. The threaded mounting type requires proper torque to avoid leaks but avoid overtightening. Since this sensor is a specific fit for Nissan Pathfinder and Infiniti QX4 models, confirm compatibility with your vehicle’s year and engine type before installation.

Quality Assurance and Warranty

Bosch oxygen sensors are manufactured to meet or exceed OEM standards, providing reliable performance and durability. The Actual OE Oxygen Sensor line undergoes rigorous testing to ensure accurate sensor output and long service life. While specific warranty details may vary, Bosch typically offers a limited warranty covering defects in materials and workmanship for this part number 13257.