Bosch 18121 Oxygen Sensor - Upstream

Reliable Oxygen Sensor for Land Rover Vehicles

The Bosch Validated Oxygen Sensor 18121 is designed specifically for Land Rover models including the LR4, Range Rover, and Range Rover Sport. This wide-band oxygen sensor ensures accurate air-fuel mixture readings to support optimal engine performance and emissions control.

• Heated oxygen sensor for faster response times
• Specific fit for Land Rover LR4, Range Rover, and Range Rover Sport
• 4-wire design with blade terminals and rectangular male connector
• Threaded mounting type with 18 mm thread diameter and 22 mm hex size
• Durable metal housing with steel finish and 6.6-inch wiring harness length
• Includes wiring harness for direct replacement installation
• Standard replacement grade for emission control sensors

About the Bosch Validated Oxygen Sensor Line

The Bosch Validated Oxygen Sensor product line focuses on providing reliable, vehicle-specific oxygen sensors that meet OEM standards. These sensors undergo rigorous validation to ensure compatibility and performance for precise emission control. The 18121 sensor is part of this line, offering a direct fit solution for select Land Rover models with a heated wide-band sensor design.

Detailed Product Description

This Bosch oxygen sensor 18121 features a heated element to reduce warm-up time, enabling quicker sensor response and improved fuel management. The sensor’s 4-wire configuration includes blade terminals and a rectangular male connector, ensuring secure electrical connections. Its threaded mounting type with an 18 mm diameter and 22 mm hex size allows for straightforward installation. The metal housing with a steel finish provides durability under harsh engine conditions. With an overall length of 10 inches and a wiring harness length of 6.6 inches, this sensor fits precisely in the exhaust system of Land Rover LR4, Range Rover, and Range Rover Sport models.

Common Applications and Issues Addressed

• Restores accurate air-fuel ratio readings for improved engine efficiency
• Resolves check engine light triggers related to oxygen sensor faults
• Helps reduce vehicle emissions by ensuring proper catalytic converter function
• Corrects poor fuel economy caused by faulty sensor signals
• Eliminates rough idling or engine hesitation linked to oxygen sensor failure

Installation Notes and Tips

When installing the Bosch 18121 oxygen sensor, ensure the engine and exhaust system are cool to avoid burns. Use a 22 mm oxygen sensor socket for removal and installation. Verify the wiring harness length and connector type match the vehicle’s factory setup. Avoid over-tightening the threaded sensor to prevent damage. Since this is a specific fit sensor, confirm compatibility with Land Rover LR4, Range Rover, or Range Rover Sport before installation.

Quality Assurance and Warranty

The Bosch Validated Oxygen Sensor 18121 is manufactured to meet OEM specifications for durability and performance. Bosch provides a standard replacement grade sensor backed by quality control processes. While specific warranty details may vary, Bosch typically offers coverage against defects in materials and workmanship to ensure reliable operation in emission control systems.