Bosch 13252 Oxygen Sensor - Upstream

Bosch Validated Oxygen Sensor for Nissan

The Bosch Validated Oxygen Sensor 13252 is a specific-fit, narrow-band heated O2 sensor for select Nissan applications. It provides air-fuel-ratio feedback to the ECU for stable closed-loop control and emissions monitoring on the 1990-1993 Nissan D21 and 1990-1993 Nissan Pathfinder, upstream.

Key Features

• Fits 1990-1993 Nissan D21, upstream
• Fits 1990-1993 Nissan Pathfinder, upstream
• Bosch Validated Oxygen Sensor line with OE-development background
• Narrow-band heated oxygen sensor for standard replacement use
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• 3-wire design with blade terminals and oblong connector
• Wiring harness included for direct replacement service
• Metal housing built for high-temperature and vibration exposure

Detailed Description

Bosch part number 13252 is a threaded upstream oxygen sensor built for specific Nissan fitment. It uses a narrow-band heated sensing element to deliver the signal the ECU relies on for fuel control, helping maintain stable combustion and emissions performance. Bosch’s validated oxygen sensor line draws on decades of OE development, including ceramic sensing technology, heater control refinement, and durable materials suited to demanding exhaust conditions. This part cross-references Monroe Shocks & Struts (e.g., 2269088G01) for the same application.

For Nissan D21 and Nissan Pathfinder owners searching for an upstream oxygen sensor replacement, Bosch 13252 offers the correct connector style, harness length, and threaded mounting configuration for the listed applications. The specific-fit design helps simplify parts matching for 1990-1993 Nissan D21 and 1990-1993 Nissan Pathfinder service work.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rich or lean fuel mixture readings at the ECU
• Rough idle or unstable closed-loop operation
• Reduced emissions control from a worn upstream sensor
• Slow sensor response during warm-up and normal driving

Installation Notes and Tips

Verify upstream location before installation and confirm the 18 mm thread size, 22 mm hex, and 3-wire connector match the vehicle harness. Inspect the exhaust bung threads and connector condition before fitting the new sensor. Use proper oxygen sensor service tools and follow the vehicle service procedure for routing and connector engagement.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development experience. The Bosch Validated Oxygen Sensor line is built to OE-proven standards for accuracy, durability, and consistent signal performance in demanding exhaust environments.