Bosch 15959 Oxygen Sensor - Downstream Right

Bosch Actual OE Oxygen Sensor 15959

Bosch 15959 is a specific-fit, narrow-band heated oxygen sensor for downstream right applications on select Nissan Frontier and Nissan Xterra models. It measures exhaust oxygen content and sends precise air-fuel-ratio data to the ECU to support stable closed-loop fuel control and lower emissions.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Narrow-band heated oxygen sensor design
• Specific fit with threaded mounting
• 4-wire configuration with square male connector
• Blade terminals and included wiring harness
• 18 mm thread size and 22 mm hex size
• Steel finish with metal housing for high-temperature service

OE-Style Sensor Design

Bosch 15959 is part of the Bosch Actual OE Oxygen Sensor line, built around Bosch’s long OE development history in switching-type O2 sensing. The sensor uses a ceramic element and controlled heater strategy to reach operating temperature quickly, helping the engine management system enter closed-loop operation sooner. For drivers searching for a downstream right oxygen sensor for 1999-2003 Nissan Frontier or 2000-2003 Nissan Xterra, this Bosch 15959 replacement follows the original equipment style used by vehicle manufacturers.

This part cross-references 226A04S113 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings at the ECU
• Slow sensor response during warm-up
• Rough combustion control caused by aging O2 sensor output
• Emissions test failures tied to a worn downstream sensor

Installation Notes and Fitment

Fits 1999-2003 Nissan Frontier, downstream right. Fits 2000-2003 Nissan Xterra, downstream right. Confirm the threaded mounting location, connector shape, wire count, and harness length before installation. Use the correct oxygen sensor socket for the 18 mm hex, and inspect the exhaust bung threads and connector routing before final tightening. Bosch 15959 is a direct replacement for the listed applications and is commonly searched as a downstream right oxygen sensor for Nissan Frontier and Nissan Xterra.

Quality Assurance

Bosch backs this sensor with more than five decades of OE oxygen sensor development. The design uses high-temperature-resistant materials and OE-proven engineering to deliver consistent signal accuracy and durable operation under heat and vibration.