Bosch 15521 Oxygen Sensor

Reliable Oxygen Sensor for Nissan and INFINITI Vehicles

The Bosch Validated Oxygen Sensor 15521 is designed specifically for select Nissan and INFINITI models, including the Altima, Maxima, Quest, M45, and Q45. This narrow-band heated oxygen sensor ensures accurate emissions control and optimal engine performance.

• Specific fit for Nissan Altima, Maxima, Quest and INFINITI M45, Q45
• Narrow-band heated oxygen sensor type for precise air-fuel mixture readings
• Threaded mounting type with 18 mm thread diameter and 22 mm hex size
• Four-wire design with blade terminals and a square male connector
• Durable metal housing finished in steel for long-lasting performance
• Includes wiring harness for straightforward connection

About the Bosch Validated Oxygen Sensor Line

The Bosch Validated Oxygen Sensor line is engineered to meet strict OEM specifications, providing reliable emissions control components tailored to specific vehicle applications. The 15521 sensor is part of this line, offering a standard replacement grade with a heated narrow-band sensor design to maintain accurate oxygen level detection and support efficient engine management systems.

Product Details and Specifications

This Bosch oxygen sensor features a threaded mounting type with an 18 mm thread diameter and a 22 mm hex size for installation using standard tools. The sensor is a narrow-band heated type, which helps the engine control unit (ECU) monitor and adjust the air-fuel ratio for optimal combustion and reduced emissions. The sensor includes a four-wire configuration with blade terminals and a square male connector, ensuring a secure and reliable electrical connection. The metal housing finished in steel provides durability against harsh engine conditions. The wiring harness is included, facilitating easier installation in compatible Nissan and INFINITI models.

Common Applications and Issues Addressed

• Restores accurate oxygen level readings for proper fuel mixture adjustments
• Helps resolve check engine light triggers related to oxygen sensor faults
• Improves fuel efficiency by enabling precise air-fuel ratio control
• Reduces harmful emissions by maintaining proper combustion
• Prevents engine performance issues caused by faulty sensor signals

Installation Notes and Tips

When installing the Bosch 15521 oxygen sensor, ensure the engine is cool to avoid burns. Use a 22 mm oxygen sensor socket or wrench for removal and installation. Verify the sensor’s wiring harness and connector match the vehicle’s factory setup to ensure proper fitment. Avoid over-tightening the sensor to prevent thread damage. Since this sensor is a specific fit for Nissan Altima, Maxima, Quest and INFINITI M45, Q45 models, confirm compatibility before installation.

Quality Assurance and Warranty

Bosch oxygen sensors are manufactured to meet OEM standards for durability and performance. The Bosch Validated Oxygen Sensor 15521 undergoes rigorous testing to ensure reliable operation in emission control systems. This part is a standard replacement grade product designed to maintain factory-level functionality. Warranty details should be confirmed with the parts provider or Bosch directly.