Bosch 17028 Oxygen Sensor - Upstream Left or Upstream Right

Bosch Wideband O2 Sensor for BMW

Bosch Part Number 17028 is an Actual OE wideband oxygen sensor built for precise air-fuel ratio measurement and stable engine management. It is a direct-fit, heated sensor with a 5-wire harness and threaded mounting for specific BMW applications, including 2006 BMW 550i upstream left and 2006 BMW 650i upstream left.

Key Features

• Wideband A/F oxygen sensor for continuous lambda-range measurement
• Heated design for faster sensor activity and improved cold-start response
• Specific-fit replacement with included wiring harness
• Oblong male connector with blade terminals
• Threaded 18 mm sensor body with 22 mm hex size
• Metal housing and ceramic sensor construction for durability
• Fits 2006 BMW 750i upstream right and 2006 BMW 750Li upstream left

Detailed Description

Bosch 17028 is part of the Bosch Actual OE Oxygen Sensor line, a product line focused on OE-style fit, sensor accuracy, and dependable signal quality for modern engine control systems. This wideband sensor provides detailed air-fuel ratio feedback to the ECU, which supports precise mixture control across changing load and temperature conditions. It is a strong match for BMW applications that require an upstream wideband sensor, including 2006 BMW 550i, 650i, 750i, and 750Li listings shown in the fitment data.

This part cross-references BMW 11787535269 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn upstream sensor
• Rough idle or drivability issues tied to inaccurate exhaust feedback
• Reduced fuel economy caused by poor mixture control
• Emissions test failures linked to sensor response problems

Installation Notes and Tips

Verify the upstream left or upstream right position against the vehicle listing before ordering. This sensor uses an 18 mm thread diameter, threaded mounting, and a 22.8 in wiring harness length with a 25 in sealing-surface-to-connector length. Confirm connector shape, terminal count, and harness routing on the vehicle before installation. For BMW 550i, 650i, 750i, and 750Li applications, match the fitment notes exactly, including the 05/2006 cutoff where listed.

Quality Assurance

Bosch has more than five decades of OE development experience and supplies oxygen sensors to the aftermarket with OE-proven engineering. Bosch pioneered the wideband A/F oxygen sensor design used in modern engine management, and this part reflects that OE-focused approach for accurate sensor output and reliable operation.