Bosch 17355 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Bosch Wideband OE Oxygen Sensor

Bosch 17355 is an Actual OE Oxygen Sensor built as a wideband air-fuel sensor for precise mixture feedback to the ECU. It is a specific-fit, heated sensor with a 5-wire harness and threaded mounting for direct replacement service on select Mercedes-Benz applications.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio measurement across the full lambda range
• Heated design for faster sensor operation and stable readings
• Specific-fit replacement with wiring harness included
• 5-wire configuration with blade terminals and oblong male connector
• Threaded mounting, 18 mm thread diameter, 22 mm hex size
• Metal housing with robust ceramic sensor construction
• Overall length: 19.8 in; wire length: 19.3 in; harness length: 16.4 in

Product Details

Bosch 17355 is part of the Bosch Actual OE Oxygen Sensor line, which focuses on OE-style replacement sensors built to match modern engine management requirements. Bosch pioneered the wideband A/F oxygen sensor design used in current low-emission systems, and this sensor follows that approach with fast light-off, controlled heater performance, and accurate feedback under changing load conditions. It is a direct-fit oxygen sensor for Mercedes-Benz models including E-Class, CLS-Class, S-Class, and GLE hybrid applications where precise upstream air-fuel monitoring is required. This part cross-references Mercedes-Benz 0095426318 for the same application.

What It Helps Address

• Check engine light related to upstream oxygen sensor performance
• Incorrect air-fuel ratio readings affecting drivability
• Reduced fuel economy caused by inaccurate sensor feedback
• Rough idle, hesitation, or inconsistent throttle response
• Emissions test failures tied to sensor response issues

Installation Notes

Fits 2019-2020 Mercedes-Benz S560e, upstream left; 2018 Mercedes-Benz CLS550, upstream right; 2014-2018 Mercedes-Benz CLS63 AMG S, upstream; 2016-2018 Mercedes-Benz GLE550e, upstream left; 2015-2017 Mercedes-Benz E400, upstream; 2014-2017 Mercedes-Benz E550, upstream; 2017 Mercedes-Benz S550, upstream; 2014-2016 Mercedes-Benz CLS550, upstream; 2014-2016 Mercedes-Benz E63 AMG S, upstream; and 2014 Mercedes-Benz CLS63 AMG, upstream. Verify connector shape, thread size, and sensor position before installation. Use the existing harness routing and ensure the sensor is tightened to the correct specification for the exhaust bung.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development and aftermarket supply experience. The sensor is engineered to deliver OE-proven accuracy, durable construction, and reliable operation in demanding thermal conditions.