Bosch 15961 Oxygen Sensor - Downstream Right

Bosch OE Oxygen Sensor for Nissan

Bosch 15961 is a specific-fit, narrow-band heated oxygen sensor for downstream right applications on select Nissan models. It provides the ECU with air-fuel-ratio feedback needed for stable closed-loop fuel control and emissions monitoring.

Key Features

• Actual OE Oxygen Sensor from Bosch Actual OE Oxygen Sensor line
• Fits 1999-2003 Nissan Frontier, downstream right
• Fits 2000-2003 Nissan Xterra, downstream right
• Narrow-band heated O2 sensor with 4-wire configuration
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Square connector with male blade terminals and included wiring harness
• Metal housing built for high-temperature and vibration exposure

Detailed Description

Bosch 15961 is a standard replacement oxygen sensor built for downstream right placement on the Nissan Frontier and Nissan Xterra. As part of Bosch’s Actual OE Oxygen Sensor line, this sensor reflects Bosch’s long OE development history, including switching-type and planar narrowband sensor designs that improve response time, lambda accuracy, and closed-loop operation. Bosch 15961 uses a heated narrow-band design to help the engine control module read exhaust oxygen content accurately across changing operating conditions.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Unstable fuel mixture control during closed-loop operation
• Reduced emissions monitoring accuracy
• Delayed sensor response after startup
• Rough combustion control caused by aging downstream O2 feedback

Installation Notes and Tips

Verify the downstream right location before installation on your Frontier or Xterra. Confirm the 18 mm thread size, 22 mm hex size, 4-wire connector, and square male plug match the original sensor. Inspect the harness routing and connector condition before connecting Bosch 15961, and use proper oxygen sensor service tools to avoid damaging the threaded bung.

Quality Assurance

Bosch builds this oxygen sensor using advanced ceramic elements, heater control, and high-temperature-resistant materials for consistent operation under thermal and vibration load. Bosch’s OE sensor development experience supports the accuracy and durability expected from an OE-style replacement for Nissan Frontier and Nissan Xterra applications.