Bosch 17107 Oxygen Sensor - Upstream

Bosch Wideband OE Oxygen Sensor

Bosch 17107 is an Actual OE wideband air-fuel oxygen sensor built for precise upstream mixture monitoring. It delivers continuous lambda-range readings to the ECU, helping maintain accurate fuel control on Mercedes-Benz diesel applications such as the E250, GLK250, ML250, and GLE300d.

The Bosch Actual OE Oxygen Sensor line focuses on OE-proven fit, fast response, and stable heater control. This Bosch 17107 uses a specific-fit design with a 5-wire harness, oblong male connector, threaded mounting, and a 18 mm thread size for direct replacement service on the listed vehicles.

Key Features

• Wideband A/F oxygen sensor for upstream air-fuel ratio monitoring
• Heated design with optimized heater control for quicker sensor activity
• Specific fit application with included wiring harness
• 5-wire configuration, blade terminals, and male oblong connector
• Threaded mount with 18 mm thread diameter and 22 mm hex size
• Metal housing built for demanding exhaust temperatures
• Part number 17107 for ordering and catalog lookup

Detailed Description

Built on Bosch wideband sensor technology, part number 17107 provides detailed exhaust feedback across the full lambda range rather than the limited on/off signal of a traditional switching sensor. That makes it a direct OE-style choice for Mercedes-Benz diesel models that rely on accurate upstream air-fuel measurement for engine management. This sensor is listed for 2013-2015 Mercedes-Benz GLK250, 2014 Mercedes-Benz E250 with Start/Stop Feature, 2015 Mercedes-Benz E250, 2015 Mercedes-Benz ML250, and 2016-2017 Mercedes-Benz GLE300d, all in the upstream position.

Bosch pioneered the first wideband A/F oxygen sensor and continues to supply OE-level sensor designs to the aftermarket. If you are replacing a failing upstream sensor on a Mercedes-Benz E250, GLK250, ML250, or GLE300d, Bosch 17107 matches the specified application and connector style for a direct service replacement.

This part cross-references Mercedes-Benz 0075421618 for the same application.

What It Helps Address

• Check engine light related to upstream oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn wideband sensor
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation from delayed or unstable sensor response
• Emission control faults tied to the upstream sensor circuit

Installation Notes

Install Bosch 17107 in the upstream exhaust location only for the listed Mercedes-Benz applications. Verify the 18 mm thread size, 22 mm hex, 5-wire connector layout, and harness routing before installation. Because this is a specific-fit sensor, compare the connector shape, terminal count, and wire length to the original unit before final assembly.

Quality Assurance

Bosch draws on more than five decades of OE sensor development, and the Actual OE Oxygen Sensor line is built to the same application standards used by vehicle manufacturers. The wideband design, ceramic construction, and heater control are engineered for reliable operation under rapid load changes and repeated thermal cycling.