Bosch 16691 Oxygen Sensor - Downstream

Bosch OE Oxygen Sensor for Downstream Control

Bosch Part Number 16691 is an Actual OE Oxygen Sensor built for precise air-fuel-ratio feedback to the ECU. It is a heated narrow-band sensor with a threaded 18 mm mount, 4-wire harness, and specific-fit design for direct replacement in supported Mercedes-Benz and Dodge applications.

Compatible With 2011-2015 Mercedes-Benz SLS AMG, downstream, and 2007-2008 Dodge Sprinter 2500 and Sprinter 3500, downstream. Bosch 16691 is engineered for stable closed-loop operation and consistent emissions monitoring across changing exhaust temperatures.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Heated narrow-band sensor for faster closed-loop response
• Specific-fit design with included wiring harness
• 4-wire, female connector with rectangular plug shape
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing built for high-temperature and vibration exposure
• Wiring harness length: 26 in; overall length: 29.3 in

Product Details

Bosch’s Actual OE Oxygen Sensor line draws on decades of original-equipment development, including narrow-band switching sensor technology used to measure exhaust oxygen content and relay accurate mixture data to the engine control unit. This Bosch 16691 sensor uses advanced ceramic elements and controlled heater operation to improve light-off speed and maintain reliable lambda feedback during cold starts and normal driving. It is a direct replacement for downstream service on the Mercedes-Benz SLS AMG and Dodge Sprinter 2500 / Sprinter 3500 listed above.

This part cross-references Mercedes-Benz 0035428418 and Dodge 68012058AA for the same application.

What It Helps Address

• Fault codes related to downstream oxygen sensor performance
• Unstable air-fuel ratio feedback to the ECU
• Delayed closed-loop operation after startup
• Emissions test failures tied to sensor response issues
• Rough combustion control caused by inaccurate exhaust readings

Installation Notes and Tips

Install Bosch 16691 in the downstream location specified for the vehicle application. Confirm the 18 mm thread size, 4-pin connector, and harness routing before installation. Use proper oxygen sensor service tools and inspect the exhaust bung threads and connector terminals for corrosion or damage before final assembly.

Quality Assurance

Bosch backs this oxygen sensor with OE development experience and materials selected for heat and vibration resistance. The design reflects Bosch’s long-running role in oxygen sensor engineering and OE-style replacement coverage for supported vehicles.