Bosch 15526 Oxygen Sensor - Downstream Right

Bosch Validated Oxygen Sensor for Nissan Pathfinder

Bosch 15526 is a specific-fit, narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It matches the downstream right position on the 2003 Nissan Pathfinder and supports stable closed-loop fuel control with OE-style signal accuracy.

The Bosch Validated Oxygen Sensor line draws on Bosch’s long OE development history, including early thimble-sensor designs and later planar narrowband technology. This product line focuses on fast sensor response, accurate lambda measurement, and durable operation under heat and vibration.

• Specific-fit oxygen sensor for the 2003 Nissan Pathfinder, downstream right
• Bosch part number 15526 for direct application lookup
• Narrow-band heated oxygen sensor with 4-wire configuration
• Threaded mounting with 18 mm thread size and 22 mm hex size
• Square male connector with blade terminals
• Wiring harness included; harness length measures 32.8 in
• Standard replacement grade for emission control service

Detailed Product Overview

Bosch 15526 is an emission control sensor that monitors exhaust oxygen content and sends feedback to the engine control unit for fuel trim adjustment. On the 2003 Nissan Pathfinder, downstream right placement means it is used after the catalyst to help the ECU evaluate exhaust conditions and maintain proper system operation. The sensor uses a heated narrow-band design with a metal housing and high-temperature-resistant construction for consistent signal output in demanding underbody conditions. If you are searching for a 2003 Nissan Pathfinder downstream right oxygen sensor or a Bosch Validated Oxygen Sensor 15526 replacement, this part matches the listed application.

This part cross-references 226A05W900 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Slow or unstable closed-loop fuel control
• Emissions test failures tied to sensor response or signal quality
• Downstream right sensor replacement on a 2003 Nissan Pathfinder

Installation Notes and Tips

Verify the downstream right location before replacement and confirm the 18 mm threaded bung size matches the vehicle exhaust connection. Inspect the connector shape, terminal count, and harness routing before installation so the square male connector and 4-wire lead align correctly with the factory harness. Use proper oxygen sensor service tools and follow vehicle-specific torque procedures to avoid thread damage.

Quality Assurance

Bosch backs this oxygen sensor with OE development experience and validated aftermarket application coverage. The sensor is built to deliver consistent signal accuracy and durable operation in high-heat, high-vibration exhaust environments.