Bosch 15665 Oxygen Sensor - Upstream Left or Upstream Right

Reliable Oxygen Sensor for Nissan and Infiniti Vehicles

The Bosch Engineered Oxygen Sensor 15665 is designed specifically for select Nissan and Infiniti models, including the FX45, M45, Pathfinder, and Q45. This narrow-band heated oxygen sensor ensures accurate emissions control and optimal engine performance.

• Specific fit for Nissan and Infiniti FX45, M45, Pathfinder, and Q45
• Heated narrow-band oxygen sensor with threaded mounting
• 18-inch wiring harness with 4-wire blade terminals and square male connector
• Durable metal housing with steel finish and 22 mm hex size
• Standard replacement grade with included wiring harness

About the Bosch Engineered Oxygen Sensor Line

The Bosch Engineered Oxygen Sensor line focuses on precision and durability, providing sensors that meet OEM specifications for emissions control. The 15665 part number is part of this line, offering a heated narrow-band sensor designed to maintain accurate air-fuel ratio readings and support efficient catalytic converter operation in Nissan and Infiniti vehicles.

Product Details and Specifications

This oxygen sensor features a threaded mounting type with an 18 mm thread diameter and 22 mm hex size for easy installation. The sensor includes a heated element to ensure quick activation and accurate readings under various operating conditions. The wiring harness is 18 inches long, equipped with 4 blade terminals and a square male connector, facilitating a secure and reliable electrical connection. The sensor's metal housing and steel finish provide durability and resistance to harsh engine environments. Overall length measures 21.7 inches, with a 20.5-inch length from sealing surface to connector end.

Common Applications and Issues Addressed

• Restores proper air-fuel mixture readings for improved engine efficiency
• Helps reduce harmful emissions by supporting catalytic converter function
• Resolves check engine light triggers related to oxygen sensor faults
• Improves fuel economy by providing accurate sensor data
• Prevents rough idling and engine performance issues caused by faulty sensors

Installation Notes and Tips

Ensure the vehicle is cool before installation to avoid burns. Use a 22 mm oxygen sensor socket for removal and installation. Verify the sensor's wiring harness length and connector type match the vehicle's factory setup. The threaded mounting requires proper torque to avoid leaks or damage. No mounting bracket is included, so use the existing mounting point on the vehicle.

Quality Assurance and Warranty

The Bosch Engineered Oxygen Sensor 15665 is manufactured to meet OEM standards for fit and function. It comes with a standard replacement grade assurance, ensuring reliable performance in Nissan and Infiniti FX45, M45, Pathfinder, and Q45 models. Warranty details should be confirmed with the point of purchase or Bosch directly.