Bosch 17039 Oxygen Sensor - Upstream

Bosch Wideband OE Oxygen Sensor

Bosch 17039 is an Actual OE wideband oxygen sensor built for precise air-fuel ratio measurement across the full lambda range. It provides the ECU with detailed feedback for accurate mixture control, helping maintain fuel efficiency, engine response, and emissions performance.

Compatible With BMW M3 upstream applications and select BMW 323i, 325i, 325xi, 330i, 330xi, 525i, 525xi, 530i, and 530xi upstream positions listed below.

Key Features

• Wide-band oxygen sensor with continuous air-fuel ratio measurement
• Heated design for faster sensor warm-up and stable operation
• Specific-fit replacement with a 5-wire harness and included wiring harness
• Blade terminals, oblong connector, male connector and terminal ends
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Robust ceramic construction for thermal cycling and load changes
• Bosch Actual OE Oxygen Sensor line backed by more than five decades of OE development

Product Details

Bosch Actual OE Oxygen Sensor 17039 uses wideband sensor technology to deliver detailed exhaust feedback that traditional switching sensors cannot provide. Bosch pioneered the planar pump-cell wideband design used in modern engine management, and this sensor reflects that OE-focused engineering approach. The 13.8-inch overall length, 12.6-inch sealing-surface-to-connector length, and 10.4-inch harness length support direct replacement on the listed BMW applications.

This part cross-references BMW 11787537984 for the same application.

What It Helps Address

• Rich or lean air-fuel mixture readings
• Check engine light concerns related to oxygen sensor performance
• Reduced fuel economy caused by inaccurate exhaust feedback
• Rough engine operation during warm-up or rapid load changes
• Emissions test failures tied to upstream sensor faults

Installation Notes

Install as an upstream oxygen sensor on the listed BMW applications only. Verify connector shape, terminal count, thread size, and harness routing before installation. Use the threaded mounting point and correct 18 mm oxygen sensor socket for removal and installation. Confirm the vehicle build date notes for 2006 BMW applications, since several listings apply only to production dates before 10/2005 or 11/2005.

Quality Assurance

Bosch supplies OE-proven oxygen sensor technology to the aftermarket, drawing on extensive original-equipment development and wideband sensor engineering. Bosch 17039 is built as a standard replacement part for the specified BMW upstream applications.

• Fits 2008-2013 BMW M3, upstream
• Fits 2006 BMW 323i, upstream, Cylinder(s) 4, 5, and 6; To 11/2005; Actual OE Oxygen Sensor
• Fits 2006 BMW 325i, upstream, Cylinder(s) 4, 5, and 6; To 10/2005; Actual OE Oxygen Sensor
• Fits 2006 BMW 325xi, upstream, Cylinder(s) 4, 5, and 6; To 11/2005; Actual OE Oxygen Sensor
• Fits 2006 BMW 330i, upstream, Cylinder(s) 4, 5, and 6; To 11/2005; Actual OE Oxygen Sensor
• Fits 2006 BMW 330xi, upstream, Cylinder(s) 4, 5, and 6; To 11/2005; Actual OE Oxygen Sensor
• Fits 2006 BMW 525i, upstream, Cylinder(s) 4, 5, and 6; To 10/2005; Actual OE Oxygen Sensor
• Fits 2006 BMW 525xi, upstream, Cylinder(s) 4, 5, and 6; To 10/2005; Actual OE Oxygen Sensor
• Fits 2006 BMW 530i, upstream, Cylinder(s) 4, 5, and 6; To 10/2005; Actual OE Oxygen Sensor
• Fits 2006 BMW 530xi, upstream, Cylinder(s) 4, 5, and 6; To 10/2005; Actual OE Oxygen Sensor