Bosch 15378 Oxygen Sensor - Downstream Right

Bosch Actual OE Oxygen Sensor 15378

Bosch 15378 is a narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It is a specific-fit replacement for the downstream right position on the 1996 INFINITI Q45, with OE-style construction for stable closed-loop control and emissions monitoring.

Key Features

• Actual OE Oxygen Sensor line from Bosch
• Narrow-band heated O2 sensor for fast operating response
• Specific fit for the downstream right location
• 4-wire design with square male connector and blade terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included for direct replacement use
• Metal housing and high-temperature-resistant construction

Product Details

Bosch 15378 uses a switching-type sensing element to measure exhaust oxygen content and send accurate feedback to the engine control unit. Bosch developed this sensor line from its long-running OE oxygen sensor technology, including planar narrowband designs that improve light-off speed, lambda accuracy, and closed-loop transition time. For a 1996 INFINITI Q45 downstream right application, this sensor supports consistent fuel control under changing thermal and vibration loads.

This part cross-references Monroe Shocks & Struts (e.g., B26A067U01) for the same application.

What It Helps Address

• Fault codes related to oxygen sensor performance
• Unstable air-fuel ratio feedback
• Delayed closed-loop operation after startup
• Exhaust emissions concerns tied to sensor aging
• Rough combustion control caused by inaccurate O2 readings

Installation Notes

Fits 1996 INFINITI Q45, downstream right. Verify the connector shape, wire count, thread size, and sensor position before installation. The threaded design uses an 18 mm thread diameter and 22 mm hex size, so the correct oxygen sensor socket or wrench is recommended. Confirm the vehicle build date note of to 11/1995 when matching this application.

Quality Assurance

Bosch backs this Actual OE Oxygen Sensor line with more than five decades of OE development and aftermarket supply experience. The sensor is built to OE-proven standards for accuracy, durability, and consistent operation in demanding exhaust conditions.