Bosch 15524 Oxygen Sensor - Upstream

Bosch Validated Oxygen Sensor 15524

Bosch Validated Oxygen Sensor 15524 is a narrow-band heated oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management for select Infiniti and Nissan applications, including upstream locations on the 2003 Nissan 350Z and 2003-2004 Infiniti G35.

Key Features

• Specific-fit Bosch oxygen sensor for direct application matching
• Narrow-band heated design for faster closed-loop operation
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• 4-wire configuration with square male connector and blade terminals
• Wiring harness included with 18.6 in harness length
• Metal housing and high-temperature-resistant construction for demanding exhaust conditions
• OE-focused Bosch Validated Oxygen Sensor line backed by decades of oxygen sensor development

Product Details

Bosch part number 15524 uses a switching-type narrow-band sensor element to report exhaust oxygen content to the engine control unit. That signal helps the ECU maintain the correct air-fuel mixture during closed-loop operation, which is important for drivability, fuel control, and emissions performance. The Bosch Validated Oxygen Sensor line reflects Bosch’s OE development background and includes designs that emphasize fast light-off, accurate lambda feedback, and consistent heater control under thermal and vibration load.

This part cross-references 22690AL600 for the same application. It is a direct replacement choice for drivers searching for a Bosch 15524 oxygen sensor for 2003 Nissan 350Z upstream, 2003-2004 Infiniti G35 upstream, or 2003-2004 Nissan Pathfinder upstream left.

Common Issues This Part Can Address

• Fault codes related to oxygen sensor response or heater circuit performance
• Rough idle or unstable air-fuel control during closed-loop operation
• Increased emissions from inaccurate exhaust oxygen readings
• Delayed sensor switching that affects fuel trim correction
• Replacement needs for worn upstream oxygen sensors on select Infiniti and Nissan models

Installation Notes

Verify the connector shape, wire count, thread size, and sensor position before installation. This Bosch 15524 oxygen sensor is an upstream, heated narrow-band unit with a threaded mount, so correct bank and position identification is important on the vehicle. Use proper exhaust sensor service procedures and confirm the harness routing clears heat sources and moving components.

Quality Assurance

Bosch has more than five decades of OE oxygen sensor development, and the Validated Oxygen Sensor line is built around OE-proven design principles for accurate feedback and durable operation in harsh exhaust environments.