Bosch 16373 Oxygen Sensor - Downstream

Bosch Actual OE Oxygen Sensor 16373

Bosch 16373 is a narrow-band heated oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It is a specific-fit downstream replacement for select Volkswagen applications, including Golf, Jetta, Beetle, Golf City, and Jetta City models.

As part of Bosch’s Actual OE Oxygen Sensor line, this sensor reflects Bosch’s long OE development history in switching-type O2 sensing, with a focus on stable closed-loop control, accurate lambda measurement, and dependable operation under heat and vibration.

Key Features

• Specific-fit downstream oxygen sensor for direct application matching
• Narrow-band heated design for faster closed-loop operation
• 4-wire configuration with included wiring harness
• Threaded mounting with 18 mm thread size and 22 mm hex size
• Oblong connector with male terminals and blade terminal type
• Metal housing for durability in high-temperature exhaust locations
• Wiring harness length: 17.5 in; overall length: 20.9 in

Detailed Description

Bosch 16373 is engineered as a standard replacement oxygen sensor for downstream exhaust monitoring on select Volkswagen vehicles. It measures exhaust oxygen content and sends the signal needed for ECU fuel-trim control, helping maintain stable combustion and emissions performance. This Bosch Actual OE Oxygen Sensor line uses advanced ceramic sensing elements and heater control strategies to support consistent response in demanding thermal conditions.

Compatible With 2001-2006 Volkswagen Golf, downstream; 2001-2005 Volkswagen Beetle, downstream; 2001-2005 Volkswagen Jetta, downstream; 2007-2010 Volkswagen Golf City, downstream; and 2007-2009 Volkswagen Jetta City, downstream. Bosch 16373 is also a direct interchange reference for URO 06A906262BG for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Unstable fuel-trim readings from a worn narrow-band sensor
• Slow sensor response during closed-loop operation
• Emissions test failures tied to oxygen sensor degradation
• Rough combustion control caused by inaccurate exhaust feedback

Installation Notes and Tips

This sensor uses threaded mounting and a 4-wire harness with a male oblong connector. Confirm the downstream location, connector shape, wire count, and thread size before installation. Because oxygen sensors are exposed to high exhaust heat, inspect the harness routing and connector condition during replacement. Use the vehicle’s exact year, make, model, and position match for Bosch 16373.

Quality Assurance

Bosch supplies OE-developed oxygen sensor technology to the aftermarket, drawing on more than five decades of sensor engineering and vehicle manufacturer experience. Bosch 16373 is built to OE-style standards for accurate signal delivery and durable operation in harsh exhaust environments.