Bosch 17051 Oxygen Sensor - Upstream

Bosch Wideband O2 Sensor for OE Control

Bosch 17051 is an Actual OE Oxygen Sensor built as a wideband air-fuel sensor for precise upstream mixture monitoring. It delivers continuous AFR feedback to the ECU, helping maintain accurate fuel control on BMW M5 and BMW M6 applications from 2006-2010.

As part of Bosch’s Actual OE Oxygen Sensor line, this sensor reflects Bosch’s OE development experience and wideband design leadership. The 17051 uses a heated, threaded, specific-fit configuration with a 5-wire harness, blade terminals, and a male oblong connector for direct replacement service.

Key Features

• Wideband A/F oxygen sensor for high-precision air-fuel ratio measurement
• Heated design for faster sensor activity and stable operation
• Specific fit replacement for upstream placement
• 21.1 in wiring harness length with wiring harness included
• 18 mm thread size and 22 mm hex size
• Metal housing with robust ceramic sensor construction
• Male oblong connector, male terminals, and 6 terminal quantity
• Standard replacement grade for OE-style service

Detailed Description

Bosch 17051 is engineered for vehicles that rely on wideband oxygen sensing to manage fuel delivery across a broad lambda range. By providing detailed AFR data to the engine control unit, this sensor supports accurate mixture correction during idle, cruise, acceleration, and load changes. It is a direct-fit upstream oxygen sensor for 2006-2010 BMW M5 and 2006-2010 BMW M6 models, making it a practical choice for OE-style emission control service.

This part cross-references Bosch OE application 11787836394 for the same application. The Bosch Actual OE Oxygen Sensor line is built around OE-proven sensor architecture, including fast light-off behavior, controlled heater operation, and durable construction for demanding thermal conditions. Bosch 17051 is a direct replacement option for BMW M5 oxygen sensor and BMW M6 upstream oxygen sensor service.

Common Issues This Sensor Can Address

• Fault codes related to upstream air-fuel ratio sensor performance
• Rough idle or inconsistent fuel trim readings
• Reduced fuel economy caused by inaccurate mixture feedback
• Emissions test failures tied to sensor response issues
• Delayed or unstable AFR signal during load changes

Installation Notes and Tips

Install Bosch 17051 in the upstream position only on the listed BMW M5 and BMW M6 applications. Confirm the 18 mm thread size, 22 mm hex size, connector shape, and harness routing before installation. Because this is a specific-fit sensor, match the connector and terminal layout to the original unit and inspect the exhaust bung threads for damage before threading the sensor into place.

Quality Assurance

Bosch supplies OE-developed oxygen sensor technology to the aftermarket, and the Actual OE Oxygen Sensor line is based on the same engineering approach used in modern engine management systems. Bosch 17051 is built for accurate signal delivery and dependable service in emission control applications.