Bosch 17015 Oxygen Sensor - Upstream

Bosch Wideband O2 Sensor for BMW Upstream Use

Bosch 17015 is an Actual OE Oxygen Sensor built for precise air-fuel ratio measurement in wideband applications. It is a specific-fit, heated sensor with a 5-wire design and integrated harness, made for upstream placement on select BMW models including the i8, 640i, 535i, X5, X6, and more.

As part of Bosch’s Actual OE Oxygen Sensor line, this wideband A/F sensor uses a planar pump-cell design and fast heater response to deliver detailed feedback to the ECU across the full lambda range. That level of signal accuracy supports cleaner combustion control in BMW turbocharged and performance applications where upstream sensor response matters.

Key Features

• Part number: 17015
• Wideband A/F oxygen sensor for upstream engine management
• Heated design with optimized heater control
• Specific-fit replacement with 5 terminals and blade-style connection
• Rectangle male connector with included wiring harness
• Threaded mounting, 18 mm thread diameter, 22 mm hex size
• Metal housing with robust ceramic sensor construction
• Overall length: 19.4 in; harness length: 16 in

Product Details

Bosch pioneered the wideband oxygen sensor format and continues to supply OE-level sensor technology for modern emissions and fuel-control systems. Bosch 17015 is engineered for accurate upstream measurement on BMW applications such as the 2014-2018 BMW 640i, 2011-2018 BMW X5, 2011-2018 BMW X6, and 2016-2018 BMW M2. It also fits select BMW i8, 535i, 435i, 335i, 740i, and ActiveHybrid models listed in the fitment data. This part cross-references Bosch OE applications for the same use case.

What It Helps Address

• Check engine light related to upstream oxygen sensor performance
• Incorrect air-fuel ratio readings at the ECU
• Rough idle or inconsistent fuel control from a failing wideband sensor
• Reduced fuel economy caused by inaccurate mixture feedback
• Emissions test failures tied to sensor response issues

Installation Notes

Install in the upstream position only where listed in the fitment data. Verify connector shape, terminal count, thread size, and harness routing before installation. Because this is a specific-fit Bosch oxygen sensor, compare the original sensor connector and mounting style to the vehicle application before replacement. For BMW 640i, 535i, X5, X6, and i8 applications, confirm the upstream location and OE-style connector match the removed part.

Quality Assurance

Bosch backs this sensor with more than five decades of OE development in emissions and engine-management technology. The 17015 is built to OE specifications for accurate signal delivery, thermal durability, and consistent performance in demanding operating conditions.