Bosch 13725 Oxygen Sensor - Downstream

Bosch OE Oxygen Sensor for Nissan Pickup

Bosch Part Number 13725 is an actual OE-style narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It is a specific-fit replacement for the downstream position on select Nissan Pickup models, including 1996 and 1997 applications.

As part of Bosch’s Actual OE Oxygen Sensor line, this sensor reflects Bosch’s long-running OE development in switching-type O2 sensing, with fast warm-up behavior, stable closed-loop control, and durable construction for demanding exhaust temperatures.

Key Features

• Specific-fit oxygen sensor for downstream placement
• Narrow-band heated design for faster closed-loop operation
• 4-wire configuration with square connector and blade terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing and high-temperature-resistant sensor construction
• Wiring harness included for direct replacement use
• Bosch Part Number 13725

Detailed Description

Bosch 13725 is engineered as a standard replacement oxygen sensor for vehicles that rely on narrow-band switching signals to manage fuel delivery and emissions control. It measures exhaust oxygen content and sends accurate feedback to the engine control unit, helping maintain stable combustion across changing load and temperature conditions. This Bosch Actual OE Oxygen Sensor line is built around Bosch’s OE sensor development history, including planar narrowband technology that improves light-off response and lambda accuracy.

Fits 1997 Nissan Pickup, downstream. Fits 1996 Nissan Pickup, downstream, from 01/1996. This part cross-references 226A01S710 for the same application. If you are replacing a downstream Nissan Pickup oxygen sensor, Bosch 13725 provides the correct specific-fit layout for the listed vehicles.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Unstable air-fuel ratio feedback to the ECU
• Reduced fuel control accuracy during closed-loop operation
• Emissions test failures tied to a worn O2 sensor
• Slow sensor response from heat cycling and exhaust exposure

Installation Notes and Tips

Verify the downstream sensor location before installation and confirm the connector shape, wire count, and thread size match the original unit. Use the threaded mounting point and correct 22 mm oxygen sensor socket for removal and installation. Inspect the harness routing and connector condition before connecting the new sensor, especially on higher-mileage Nissan Pickup exhaust systems.

Quality Assurance

Bosch has more than five decades of OE oxygen sensor development behind this design, and the Actual OE Oxygen Sensor line is built to OE-proven standards for accuracy, durability, and consistent signal output under heat and vibration.