Bosch 17347 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Bosch Wideband Oxygen Sensor for Mercedes-Benz

Bosch 17347 is an Actual OE oxygen sensor built for precise air-fuel ratio measurement in wideband applications. It is a direct-fit, heated sensor for specific Mercedes-Benz upstream positions, including GLE580, GLS580, G63 AMG, C43 AMG, E450, S550, and related models.

As part of Bosch’s Actual OE Oxygen Sensor line, this wideband A/F sensor uses Bosch’s planar pump-cell design and OE-level engineering to deliver fast response, stable heater control, and accurate feedback to the engine control unit.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio monitoring
• Heated design for faster sensor activity and stable operation
• Specific-fit replacement with a 5-wire harness and 6-terminal configuration
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing with robust ceramic sensor construction
• Wiring harness included with 20.5 in wire length and 17.6 in harness length
• Actual OE Oxygen Sensor line for OE-style fit and function

Detailed Description

Bosch 17347 is engineered for vehicles that rely on wideband oxygen sensing to manage fuel delivery under changing load and temperature conditions. It provides the ECU with detailed lambda feedback across the full operating range, helping maintain accurate mixture control in Mercedes-Benz turbocharged and performance applications. This part number is commonly searched as Bosch 17347 oxygen sensor and Bosch wideband O2 sensor 17347 for Mercedes-Benz upstream right or upstream left locations, depending on the vehicle.

This part cross-references Mercedes-Benz OE numbers 0095425918 and 0095426018 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn wideband sensor
• Rough idle, hesitation, or inconsistent throttle response
• Reduced fuel economy caused by inaccurate exhaust feedback
• Emissions faults tied to slow or unstable sensor response

Installation Notes and Tips

Verify the exact position before ordering, since this sensor is used in upstream right, upstream left, and upstream locations across different Mercedes-Benz applications. Confirm connector shape, terminal count, thread size, and harness routing against the original sensor before installation. Use the vehicle’s service procedure for torque and connector handling, and inspect the exhaust bung threads for damage or contamination before threading in the new sensor.

Quality Assurance

Bosch has more than five decades of OE development in oxygen sensing technology. The 17347 is built to Bosch OE standards for accurate signal control, reliable heater performance, and durable operation in demanding thermal conditions.