Bosch 16272 Oxygen Sensor - Upstream

Bosch OE Oxygen Sensor for Mercedes-Benz

Bosch 16272 is an Actual OE Oxygen Sensor built as a narrow-band heated replacement for precise air-fuel ratio feedback to the ECU. It is a specific-fit sensor with a 4-wire harness, round female connector, and threaded mounting for direct service on select Mercedes-Benz applications.

For drivers searching for a Bosch 16272 oxygen sensor for Mercedes-Benz CLS500, CLS55 AMG, E500, E55 AMG, E320, or C230 upstream locations, this part follows OE-style sensor architecture and connector layout. Bosch’s long OE development history is reflected in the sensor’s ceramic element design, heater control, and high-temperature materials for stable closed-loop operation.

Key Features

• Bosch Actual OE Oxygen Sensor, part number 16272
• Narrow-band heated oxygen sensor for upstream exhaust monitoring
• Specific-fit design with included wiring harness
• 4-wire, pin terminal, round female connector
• Threaded mount with 18 mm thread diameter and 22 mm hex size
• Metal housing for standard replacement service
• Wiring harness length: 13.6 in; overall length: 16.9 in

Detailed Description

Bosch 16272 measures exhaust oxygen content and sends the signal the engine control unit uses to maintain proper combustion control. As a narrow-band heated sensor, it supports quicker closed-loop response after startup and consistent signal output across changing thermal loads. This makes it a direct replacement choice for Mercedes-Benz upstream oxygen sensor service where OE-style signal behavior matters.

Compatible With 2006 Mercedes-Benz CLS500, Upstream; 2006 Mercedes-Benz CLS55 AMG, Upstream; 2003-2006 Mercedes-Benz E500, Upstream; 2003-2006 Mercedes-Benz E55 AMG, Upstream; 2003-2005 Mercedes-Benz E320, Upstream; and 2002 Mercedes-Benz C230, Upstream. This Bosch 16272 application coverage is focused on specific-fit Mercedes-Benz models rather than universal use.

This part cross-references 0015400517 for the same application.

What It Helps Address

• Faulty upstream oxygen sensor readings
• Rich or lean fuel trim concerns caused by inaccurate exhaust feedback
• Check engine light conditions related to oxygen sensor performance
• Slow sensor response during closed-loop operation
• Emissions test failures tied to sensor signal degradation

Installation Notes and Tips

Install Bosch 16272 in the upstream exhaust location only for the listed Mercedes-Benz applications. Verify connector shape, wire count, thread size, and harness length before installation. Use the correct oxygen sensor socket and inspect the exhaust bung threads for damage or contamination before threading the sensor into place.

Because this is a heated narrow-band sensor, confirm the vehicle’s wiring and connector condition are in good repair before finalizing the installation. Clear diagnostic trouble codes after replacement and verify sensor operation with a scan tool if available.

Quality Assurance

Bosch supplies this Actual OE Oxygen Sensor using OE development experience that began with its original oxygen sensor work and later planar narrowband designs. The result is a replacement sensor built to deliver stable measurement, fast light-off behavior, and durable performance under heat and vibration.