Bosch 17230 Oxygen Sensor - Upstream

Bosch Wideband O2 Sensor for BMW

Bosch 17230 is an Actual OE wideband air-fuel oxygen sensor built for precise upstream mixture feedback. It delivers continuous lambda measurement for accurate ECU control, helping maintain fuel efficiency, drivability, and lower emissions in demanding operating conditions.

Compatible With 2011 BMW 528i, upstream, and 2011-2012 BMW X3, upstream. This Bosch oxygen sensor is a direct-fit, specific application replacement for vehicles using a 5-wire wideband design with a threaded 18 mm mount.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio measurement
• Heated design for faster light-off and stable operation
• Specific-fit replacement with oblong male connector and blade terminals
• 36.8 in wiring harness length with included harness
• Metal housing with threaded mounting and 22 mm hex size
• OE-style Bosch engineering for modern engine management systems
• Part number 17230 for BMW X3 and BMW 528i upstream applications

Product Details

Bosch 17230 is part of the Bosch Actual OE Oxygen Sensor line, which focuses on OE-proven sensor technology for modern emissions systems. Bosch pioneered the wideband planar pump-cell design used in current engine management, and this sensor follows that approach with fast response, optimized heater control, and robust ceramic construction. For BMW X3 and BMW 528i applications, the sensor provides the ECU with detailed upstream air-fuel data needed for precise fuel control under changing load and temperature conditions.

This part cross-references BMW 11787589138 for the same application.

Common Issues This Sensor Can Address

• Check engine light related to upstream oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn wideband sensor
• Rough idle or hesitation caused by inaccurate mixture feedback
• Reduced fuel economy from poor ECU fuel-trim control
• Higher emissions from delayed or unstable sensor response

Installation Notes

Verify the connector shape, wire count, and thread size before installation. This sensor uses a threaded 18 mm mount, a male oblong connector, and a 6-terminal configuration with an included wiring harness. Confirm upstream placement and engine application on the BMW X3 or BMW 528i before replacing the original sensor.

Quality Assurance

Bosch supplies this sensor as an OE-style replacement backed by more than five decades of oxygen-sensor development and production experience. The design reflects Bosch’s long-standing role in wideband sensor technology used by vehicle manufacturers.