Bosch 15821 Oxygen Sensor - Upstream Left

Overview of Bosch Actual OE Oxygen Sensor 15821

The Bosch Actual OE Oxygen Sensor 15821 is designed specifically for Nissan Frontier and Xterra models, ensuring precise emission control and optimal engine performance. This narrow-band heated oxygen sensor features a threaded mounting type and a durable steel housing for reliable operation.

• Compatible with Nissan Frontier and Xterra vehicles
• Part number 15821 for exact fit and function
• Narrow-band heated oxygen sensor for accurate air-fuel mixture readings
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• 31.9-inch wiring harness length with 3-wire blade terminals and oblong male connector
• Standard replacement grade with metal housing and steel finish
• Includes wiring harness for straightforward installation

Detailed Features and Specifications

This Bosch oxygen sensor is a specific fit part engineered for Nissan Frontier and Xterra models, providing a direct replacement for the original equipment sensor. The sensor type is narrow-band heated, which allows it to quickly reach operating temperature and deliver accurate oxygen level readings to the engine control unit. The sensor’s metal housing and steel finish contribute to its durability under high-temperature exhaust conditions. It features a 3-wire configuration with blade-type terminals and an oblong male connector, ensuring secure electrical connections. The wiring harness length measures 31.9 inches, with an overall length of 35.6 inches, including a 34.4-inch length from the sealing surface to the end of the connector. The threaded mounting type uses an 18 mm diameter thread and a 22 mm hex size for installation.

About the Bosch Actual OE Oxygen Sensor Product Line

The Bosch Actual OE Oxygen Sensor line is designed to meet or exceed original equipment specifications, providing reliable emission control sensor replacements. This product line focuses on delivering precise fitment and consistent performance for specific vehicle applications, such as the Nissan Frontier and Xterra. By using genuine Bosch technology, these sensors help maintain engine efficiency and comply with emission standards.

Common Applications and Issues Addressed

• Restores accurate air-fuel ratio readings for improved fuel efficiency
• Resolves check engine light triggers related to oxygen sensor faults
• Helps reduce harmful emissions by ensuring proper catalytic converter function
• Eliminates rough idling or engine hesitation caused by faulty sensors
• Prevents failed emissions tests due to sensor malfunction

Installation Notes and Tips

When installing the Bosch 15821 oxygen sensor, ensure the engine and exhaust system are cool to avoid burns. Use the correct 22 mm hex socket for sensor removal and installation. Verify the wiring harness length and connector type match the vehicle’s original sensor to ensure proper fit. Avoid over-tightening the threaded sensor to prevent damage to the exhaust manifold or sensor threads. It is recommended to apply anti-seize compound on the sensor threads if not pre-coated.

Quality Assurance and Warranty

Bosch oxygen sensors are manufactured to meet strict quality standards, ensuring reliable performance and durability. The Actual OE Oxygen Sensor 15821 is a standard replacement grade part designed for long service life. While specific warranty details may vary, Bosch typically offers coverage against defects in materials and workmanship. Always refer to the product documentation or Bosch for warranty terms applicable to this sensor.