Bosch 16330 Oxygen Sensor - Downstream or Upstream

Bosch Actual OE Oxygen Sensor for Mercedes-Benz

Bosch 16330 is a specific-fit, narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It supports stable combustion control and emissions management across changing operating conditions, making it a direct replacement choice for select Mercedes-Benz G-Class applications.

The Bosch Actual OE Oxygen Sensor line reflects Bosch’s long OE development history, including early thimble-style sensors and later planar narrowband designs that improved warm-up speed, lambda accuracy, and closed-loop response. Bosch 16330 uses advanced ceramic elements, optimized heater control, and high-temperature-resistant materials for consistent operation in demanding exhaust environments.

Key Features

• Specific-fit Bosch oxygen sensor for select Mercedes-Benz applications
• Narrow-band heated O2 sensor for closed-loop fuel control
• Round female connector with 4 terminals and 4-wire harness
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Steel-finish metal housing for exhaust-system service
• Wiring harness included; harness length measures 7.3 in
• Overall length measures 10.6 in; sealing surface to connector end measures 9.4 in

Detailed Description

Bosch part number 16330 is an Actual OE Oxygen Sensor engineered for accurate switching-type signal output in narrow-band applications. It is heated for faster operating temperature and more consistent feedback, helping the engine control module maintain the proper air-fuel mixture during warm-up and normal driving. This Bosch oxygen sensor is a strong match for Mercedes-Benz G55 AMG and G500 models where OE-style sensor response and connector fit are important.

Fits 2003-2011 Mercedes-Benz G55 AMG, upstream. Fits 2005-2008 Mercedes-Benz G500, upstream. Fits 2002-2004 Mercedes-Benz G500, downstream to chassis #144225. Fits 2004 Mercedes-Benz G500, upstream from chassis #144226. This part cross-references 0015407917 for the same application.

What It Helps Address

• Check engine light caused by oxygen sensor signal faults
• Rough idle or unstable air-fuel control from a worn sensor
• Delayed closed-loop operation after cold start
• Emissions test failures related to sensor response or accuracy
• Fuel trim issues tied to aging upstream or downstream O2 sensor performance

Installation Notes and Tips

Verify the sensor position, connector style, and chassis breakpoints before installation. Bosch 16330 uses a threaded mount with an 18 mm thread size and a 22 mm hex, so the correct oxygen sensor socket or wrench is recommended. Confirm the harness routing and connector orientation on Mercedes-Benz G55 AMG and G500 applications before final tightening.

Quality Assurance

Bosch supplies this Actual OE Oxygen Sensor using OE-proven engineering and materials developed for long-term exhaust heat and vibration exposure. The sensor is built to deliver consistent signal quality and dependable operation in the same type of applications trusted by vehicle manufacturers.