Bosch 13261 Oxygen Sensor - Downstream Left or Downstream Right

Bosch OE Oxygen Sensor for Infiniti J30

Bosch 13261 is an Actual OE Oxygen Sensor built as a standard replacement for specific Infiniti applications. It uses a narrow-band heated design to deliver accurate air-fuel-ratio feedback to the ECU, helping maintain stable closed-loop operation and emissions control.

Compatible With 1996-1997 Infiniti J30 downstream left and downstream right positions, this Bosch oxygen sensor is built for direct-fit service on the original threaded mounting location. The Bosch 13261 part number is a practical OE-style replacement for drivers servicing a 1996-1997 Infiniti J30 oxygen sensor issue.

Key Features

• Actual OE Oxygen Sensor from Bosch Actual OE Oxygen Sensor line
• Narrow-band heated sensor for precise switching-type signal output
• Specific fit design for direct replacement service
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• 4-wire harness with square female connector and pin terminals
• Wiring harness included for application-specific installation
• Steel finish with metal housing for high-temperature service

Product Details

Bosch 13261 is engineered around Bosch’s long OE oxygen sensor development history, using ceramic sensing elements, controlled heater operation, and heat-resistant materials to maintain consistent signal quality under thermal and vibration load. As a narrow-band heated oxygen sensor, it monitors exhaust oxygen content and sends feedback to the engine control unit so fuel delivery can be adjusted during closed-loop operation. For Infiniti J30 service, this sensor supports downstream left and downstream right replacement needs with the correct connector style and harness length.

This part cross-references Bosch 226A018Y05 and 226A118Y05 for the same application.

Common Problems It Can Address

• Check engine light related to oxygen sensor performance
• Erratic air-fuel ratio feedback to the ECU
• Rough idle or inconsistent closed-loop fuel control
• Failed emissions inspection tied to sensor response issues
• Slow sensor switching from heat or age-related wear

Installation Notes

Verify the connector shape, wire count, and threaded mounting location before installation. This Bosch 13261 sensor uses a 18 mm thread size and a square female connector, so matching the original harness and exhaust bung is important for proper fitment. Inspect the exhaust threads and surrounding wiring for heat damage before installing the replacement sensor on your Infiniti J30.

Quality Assurance

Bosch supplies OE-proven oxygen sensor technology to the aftermarket, drawing on more than five decades of original equipment development. The Bosch 13261 is built to the same functional standards expected from an OE replacement oxygen sensor for 1996-1997 Infiniti J30 service.