Bosch 16421 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Overview of Bosch Actual OE Oxygen Sensor 16421

The Bosch Actual OE Oxygen Sensor 16421 is designed specifically for select BMW and Rolls-Royce models, including the 550i, 650i, 750i, 750Li, 760Li, M3, Phantom, X5, and X6. This narrow-band heated oxygen sensor ensures accurate emissions control and optimal engine performance by providing precise air-fuel mixture data.

• Specific fit for BMW and Rolls-Royce vehicles
• Heated narrow-band oxygen sensor for reliable operation
• Threaded mounting type with 18 mm thread diameter and 22 mm hex size
• Includes a 9.8-inch wiring harness with 4-pin female connectors
• Durable metal housing finished in steel for long-lasting use
• Standard replacement grade for direct OE compatibility
• Overall length of 13.2 inches with 12-inch sealing surface to connector length

Detailed Product Description

The Bosch Actual OE Oxygen Sensor 16421 is engineered as a standard replacement part, maintaining the original equipment specifications for a precise fit and function. Featuring a heated narrow-band sensor type, it supports efficient combustion by accurately measuring oxygen levels in the exhaust gases. The sensor’s metal housing and steel finish provide durability under high-temperature conditions. Its threaded mounting type with an 18 mm diameter and 22 mm hex size allows for straightforward installation using common automotive tools.

The sensor includes a 9.8-inch wiring harness with four wires and female pin terminals, designed with a round connector shape to ensure secure electrical connections. This specific fit oxygen sensor is compatible with a range of BMW models such as the 550i, 650i, 750i, 750Li, 760Li, and M3, as well as Rolls-Royce Phantom, X5, and X6 models, making it a reliable choice for maintaining emissions compliance and engine efficiency.

About the Bosch Actual OE Oxygen Sensor Line

The Actual OE Oxygen Sensor line by Bosch is developed to meet original equipment standards, providing direct replacement sensors that match factory specifications. This product line focuses on delivering precise sensor performance and durability, ensuring that vehicles maintain proper emissions control and engine management. The 16421 sensor is part of this line, offering a reliable solution for BMW and Rolls-Royce owners requiring a specific fit oxygen sensor.

Common Applications and Issues Addressed

• Restores accurate air-fuel ratio readings for engine control units
• Resolves check engine light triggers related to oxygen sensor faults
• Improves fuel efficiency by ensuring proper combustion
• Reduces harmful emissions by maintaining correct sensor feedback
• Prevents engine performance issues caused by faulty oxygen sensors

Installation Notes and Tips

• Use a 22 mm oxygen sensor socket for removal and installation
• Ensure the threaded mounting surface is clean before installation
• Do not overtighten; torque to manufacturer specifications
• Verify connector compatibility with the vehicle’s wiring harness
• Handle the sensor carefully to avoid damaging the heated element

Quality Assurance and Warranty

Bosch oxygen sensors are manufactured to meet strict quality standards, ensuring reliable performance and durability. The Actual OE Oxygen Sensor 16421 undergoes rigorous testing to comply with OEM specifications. While specific warranty details may vary, Bosch typically offers coverage against defects in materials and workmanship, providing confidence in the sensor’s long-term functionality.