Bosch 15343 Oxygen Sensor - Upstream Right

Bosch 15343 Oxygen Sensor for OE Fitment

Bosch 15343 is an Actual OE Oxygen Sensor built as a narrow-band heated replacement for precise air-fuel ratio feedback. It is engineered for the upstream right position on select Nissan Pathfinder and INFINITI QX4 applications, helping the ECU maintain stable closed-loop fuel control.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Narrow-band heated sensor design for fast operating response
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Specific fit replacement with round connector and included wiring harness
• Steel-finish metal housing for high-temperature service
• 3-wire sensor configuration with 4-terminal connector layout

Product Details

Bosch 15343 uses Bosch’s OE development experience in switching-type oxygen sensing to deliver accurate exhaust feedback under changing load and temperature conditions. The sensor’s ceramic element and heater control help it reach operating temperature quickly, supporting closed-loop operation and emissions control. For drivers searching for a 2001 Nissan Pathfinder upstream right oxygen sensor or a 2002-2003 INFINITI QX4 upstream right oxygen sensor, this part provides the OE-style replacement format expected for those applications. This part cross-references Nissan 226904W021 for the same application.

Vehicle Fitment

• Fits 2002-2003 INFINITI QX4, upstream right.
• Fits 2001-2002 Nissan Pathfinder, upstream right.
• Fits 2001 INFINITI QX4, upstream right, late production.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Rough idle caused by inaccurate air-fuel ratio feedback
• Reduced fuel control response in closed-loop operation
• Emissions test failure tied to a worn upstream sensor
• Slow sensor switching from heat or age-related degradation

Installation Notes

Install Bosch 15343 in the upstream right location only for the listed vehicles. Confirm the threaded bung size, connector shape, and harness routing before installation. Because this is a heated narrow-band sensor, verify the electrical connector is fully seated and inspect nearby exhaust components for damage or contamination that could affect sensor readings.

Quality Assurance

Bosch has more than five decades of OE oxygen sensor development behind this design. The Actual OE Oxygen Sensor line is built to deliver OE-proven measurement accuracy and durable operation in demanding exhaust environments.