Bosch 15857 Oxygen Sensor - Downstream

Reliable Oxygen Sensor for Mercury Quest and Nissan Villager

The Bosch Actual OE Oxygen Sensor 15857 is designed specifically for Mercury Quest and Nissan Villager models. This narrow-band heated oxygen sensor ensures accurate emissions control and optimal engine performance by providing precise air-fuel mixture data to the vehicle's engine management system.

• Specific fit for Mercury Quest and Nissan Villager
• Heated narrow-band oxygen sensor for improved response
• Threaded mounting type with 18 mm thread diameter and 22 mm hex size
• Includes 30-inch wiring harness with 4 male blade terminals and square male connector
• Durable metal housing finished in steel for long-lasting use
• Standard replacement grade for reliable performance

About the Bosch Actual OE Oxygen Sensor Product Line

The Bosch Actual OE Oxygen Sensor line is engineered to meet original equipment specifications, providing a direct replacement for factory-installed sensors. This ensures compatibility and performance consistency for vehicles like the Mercury Quest and Nissan Villager. The product line focuses on delivering precise sensor readings with heated elements to reduce warm-up time and maintain emissions compliance.

Product Details and Specifications

This Bosch oxygen sensor features a narrow-band sensor type with heating capability to quickly reach operating temperature. The sensor is threaded with an 18 mm diameter and 22 mm hex size for secure installation. It comes with a 30-inch wiring harness that includes four wires and a square-shaped male connector with four blade terminals, facilitating a direct fit without modification. The sensor housing is constructed from metal with a steel finish, weighing approximately 0.36 pounds. The overall length from sealing surface to connector end is 32.5 inches, providing ample reach for installation in the specified vehicles.

Common Applications and Issues Addressed

• Restores accurate oxygen sensing for proper air-fuel mixture control
• Helps resolve check engine light codes related to oxygen sensor failure
• Improves fuel efficiency by ensuring correct emissions feedback
• Reduces vehicle emissions by maintaining proper sensor function
• Prevents rough idling and engine performance issues caused by faulty sensors

Installation Notes and Tips

Installation requires a threaded mounting with an 18 mm thread diameter and 22 mm hex size wrench. The sensor includes a 30-inch wiring harness with a square male connector, so ensure compatibility with the vehicle’s wiring harness. No mounting bracket is included, so use the existing mounting point on the exhaust system. Handle the sensor carefully to avoid damage to the wiring or sensor tip during installation.

Quality Assurance and Warranty

The Bosch Actual OE Oxygen Sensor 15857 is manufactured to meet OEM standards for fit, form, and function. It is a standard replacement grade sensor designed for durability and reliable operation. While specific warranty details are not provided here, Bosch products typically come with manufacturer-backed quality assurance to support long-term use in Mercury Quest and Nissan Villager vehicles.