Bosch 16693 Oxygen Sensor - Downstream

Bosch OE Oxygen Sensor for Mercedes-Benz

Bosch 16693 is a specific-fit, narrow-band heated oxygen sensor for downstream use on select Mercedes-Benz applications. It provides precise air-fuel-ratio feedback to the ECU, helping maintain stable combustion control and lower emissions in normal driving conditions.

Built on Bosch Actual OE Oxygen Sensor engineering, this part reflects Bosch’s long OE development history in oxygen sensing technology. It uses a threaded metal housing, a 4-wire harness, and a rectangular female connector for direct replacement service on the listed Mercedes-Benz G550 applications.

Key Features

• Fits 2009-2015 Mercedes-Benz G550, downstream
• Bosch part number 16693
• Actual OE Oxygen Sensor line for OE-style replacement
• Narrow-band heated oxygen sensor for closed-loop fuel control
• Specific-fit design with included wiring harness
• 4-wire, pin-terminal, rectangular female connector
• Threaded mounting with 18 mm thread size and 22 mm hex

Product Details

Bosch 16693 is a downstream oxygen sensor engineered for accurate exhaust-gas monitoring on the Mercedes-Benz G550. As part of Bosch’s Actual OE Oxygen Sensor line, it uses advanced ceramic sensing elements, controlled heater operation, and heat-resistant materials to maintain consistent signal output under thermal and vibration stress. This helps the ECU adjust fuel delivery based on real exhaust conditions, supporting smoother operation and emissions control. This part cross-references Mercedes-Benz 0035428518 for the same application.

Common Issues This Sensor Can Help Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn downstream sensor
• Reduced closed-loop fuel control accuracy
• Emissions test failures tied to sensor response issues
• Rougher combustion control caused by aging sensor elements

Installation Notes and Tips

Confirm the downstream location before installation and match the connector, wire count, and thread size to the original sensor. The threaded design uses an 18 mm thread size and 22 mm hex, so the correct oxygen sensor socket is recommended. Verify harness routing and connector seating to avoid strain on the lead during service.

Quality Assurance

Bosch has more than five decades of OE oxygen sensor development, and the Actual OE Oxygen Sensor line is built to OE-proven standards for accuracy and durability. Bosch 16693 is intended for direct replacement on the listed Mercedes-Benz G550 applications.