Bosch 16320 Oxygen Sensor - Downstream Left

Bosch OE Oxygen Sensor for Mercedes-Benz

Bosch 16320 is an Actual OE Oxygen Sensor built for precise air-fuel-ratio feedback to the ECU. It is a narrow-band heated sensor with a threaded mount, round female connector, and included wiring harness for direct replacement service on select Mercedes-Benz models.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Narrow-band heated design for closed-loop fuel control
• Specific fit with 4-wire, pin-terminal configuration
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Round female connector with wiring harness included
• Metal housing built for high-temperature and vibration exposure
• Fits 2001-2003 Mercedes-Benz CLK320, downstream left
• Fits 2001-2003 Mercedes-Benz CLK430, downstream left
• Fits 2001-2002 Mercedes-Benz CLK55 AMG, downstream left

Product Details

Bosch 16320 uses a switching-type narrow-band sensing element to measure exhaust oxygen content and send accurate feedback to the engine control unit. Bosch developed this oxygen sensor technology through decades of OE engineering, including faster light-off and improved closed-loop response in later planar designs. For Mercedes-Benz CLK320, CLK430, and CLK55 AMG applications, this downstream left sensor supports stable combustion control and emissions monitoring under normal driving and thermal load conditions. This part cross-references Mercedes-Benz 0015407117 for the same application.

Common Issues This Sensor Can Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Rough or unstable combustion control caused by a worn sensor
• Emissions test failure tied to oxygen sensor response issues
• Slow sensor switching or degraded heater operation

Installation Notes

Verify the downstream left location before installation and confirm the 18 mm thread size, 22 mm hex, and 4-wire connector style match the original sensor. Inspect the harness routing and connector condition during replacement, and clear diagnostic trouble codes after installation if required by the vehicle repair procedure.

Quality Assurance

Bosch supplies this Actual OE Oxygen Sensor using OE-proven engineering and durable materials developed for demanding thermal and vibration conditions. The Bosch 16320 reflects the brand’s long-running oxygen sensor development for accurate replacement performance on Mercedes-Benz applications.