Bosch 17102 Oxygen Sensor - Upstream or Upstream Rear

Bosch Wideband OE Oxygen Sensor

Bosch 17102 is an Actual OE Oxygen Sensor built as a wideband air-fuel ratio sensor for precise engine management. It provides continuous AFR feedback across the full lambda range, helping the ECU maintain accurate mixture control in BMW applications such as the 335i, 135i, Z4, and 1 Series M.

The Bosch Actual OE Oxygen Sensor line reflects Bosch’s long OE development history and uses the same type of planar pump-cell design that helped establish the modern wideband standard. Bosch 17102 is a direct-fit, heated, specific-fit sensor with a 5-wire harness, oblong male connector, and threaded metal housing for service replacement on the listed BMW platforms.

Key Features

• Wideband A/F oxygen sensor for precise air-fuel ratio measurement
• Heated design for faster sensor activity after startup
• Specific-fit replacement with included wiring harness
• 5-wire configuration with 6 terminals and blade-style terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing with robust ceramic sensor construction
• Overall length: 48.0 in; sealing surface to connector end: 46.9 in

Detailed Description

Bosch 17102 is engineered for BMW engines that rely on wideband feedback for accurate fuel control under changing load and temperature conditions. By measuring the air-fuel ratio continuously rather than switching at a narrow threshold, this sensor gives the ECU more detailed data for mixture correction, which supports stable drivability, efficient combustion, and lower emissions. It is a direct replacement for the upstream rear or upstream locations listed for 2007-2016 BMW 335i, 335i xDrive, 335xi, 335is, 135i, Z4, and 1 Series M applications.

This Bosch Actual OE Oxygen Sensor line is built around OE-proven engineering and is intended for vehicles that require a wideband sensor with the correct connector shape, terminal layout, and harness length. Part number 17102 is also referenced as Bosch 17102 for catalog and search use.

This part cross-references URO 11787558087 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 or hesitation caused by inaccurate mixture control
• Reduced fuel economy from poor fuel trim correction
• Emissions test failures tied to sensor response issues

Installation Notes and Tips

• Verify the connector style, wire count, and sensor position before installation.
• Use the listed BMW fitment only: Fits 2007-2010 BMW 335i, Upstream; Fits 2008-2010 BMW 135i, Upstream; Fits 2009-2016 BMW Z4, Upstream Rear; Fits 2011-2013 BMW 335is, Upstream Rear; Fits 2011 BMW 1 Series M, Upstream Rear; Fits 2009-2010 BMW 335i xDrive, Upstream Rear; Fits 2007-2008 BMW 335xi, Upstream Rear.
• Inspect the exhaust manifold and harness routing for heat damage before replacing the sensor.
• Confirm thread size and hex size match the original sensor during service.

Quality Assurance

Bosch supplies this oxygen sensor as part of its Actual OE Oxygen Sensor line, backed by more than five decades of OE development and aftermarket supply experience. The design emphasizes fast light-off, controlled heater operation, and durable construction for consistent performance in demanding BMW engine management systems.