Bosch 15871 Oxygen Sensor - Downstream

Bosch Actual OE Oxygen Sensor for Nissan Frontier

Bosch Part Number 15871 is a specific-fit, narrow-band heated oxygen sensor for the 1998-2000 Nissan Frontier, downstream, without California Emission System. It uses a 4-wire harness, square connector, and threaded mounting to deliver accurate air-fuel-ratio feedback to the ECU for stable closed-loop operation.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Fits 1998-2000 Nissan Frontier, downstream
• Specific fit for vehicles without California Emission System
• Narrow-band heated oxygen sensor design
• 4-wire harness with square male connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included for direct replacement
• Metal housing built for high-temperature and vibration exposure

Product Line Details

Bosch Actual OE Oxygen Sensor parts are built from Bosch’s long-running OE oxygen sensor development. The line uses ceramic sensing elements, controlled heater operation, and heat-resistant materials to support accurate lambda measurement and quicker closed-loop response in everyday driving conditions.

Detailed Description

This Bosch oxygen sensor is engineered for the downstream position on the Nissan Frontier and is listed for 1998, 1999, and 2000 model years. Bosch Part Number 15871 follows the original equipment style used by vehicle manufacturers, making it a direct replacement choice when the factory sensor needs to be restored. The narrow-band heated design helps the engine control module monitor exhaust oxygen content and maintain proper fuel control across changing load and temperature conditions.

This part cross-references 226A03S561 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rich or lean fuel mixture readings at the ECU
• Slow closed-loop fuel control response
• Emissions test failures tied to downstream sensor output
• Rough combustion control caused by a worn sensor element

Installation Notes and Tips

Verify the vehicle is a 1998-2000 Nissan Frontier with the downstream sensor location and without California Emission System before ordering Bosch 15871. The sensor uses a threaded mount, 18 mm thread size, and a 4-wire square connector with a male terminal layout. Inspect the harness routing and connector condition before installation, and confirm the exhaust threads are clean to support proper seating.

Quality Assurance

Bosch supplies this Actual OE Oxygen Sensor line with OE-proven design and materials developed from decades of oxygen sensor engineering. The sensor is built for consistent signal output under heat and vibration, supporting dependable replacement performance in the Nissan Frontier application.