Bosch 17272 Oxygen Sensor - Upstream

Bosch Wideband OE Oxygen Sensor

Bosch 17272 is an Actual OE wideband oxygen sensor built for precise air-fuel ratio measurement in modern engine management systems. It is a heated, specific-fit sensor with a 5-wire harness and threaded mounting, made for upstream use on select BMW applications including 320i, 328i, X3, X5, and more.

For BMW owners searching for an upstream wideband O2 sensor replacement, Bosch 17272 delivers OE-style signal accuracy and stable operation across changing load and temperature conditions. This part cross-references URO 11787589121 for the same application.

Key Features

• Wideband A/F oxygen sensor for continuous lambda measurement
• Heated design for faster sensor warm-up and stable operation
• Specific-fit replacement with 5-wire harness included
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing with rectangular male connector
• Overall length: 16.1 in; wire length: 15.7 in
• OE-developed Bosch design for modern fuel control systems

Product Details

Bosch 17272 is part of the Bosch Actual OE Oxygen Sensor line, which focuses on OE-proven sensor design and calibration for modern emissions systems. Bosch pioneered the wideband A/F oxygen sensor architecture used in current engine management, and this sensor follows that approach with a planar pump-cell design, optimized heater control, and robust ceramic construction. The result is a sensor that provides detailed air-fuel feedback to the ECU for accurate mixture control under steady cruise, acceleration, and rapid load changes.

Compatible With 2012-2016 BMW 328i, Upstream; 2013-2018 BMW 320i, Upstream; 2016-2018 BMW X5, Upstream; and other listed BMW applications. Bosch 17272 is also a strong search match for BMW 320i upstream oxygen sensor, BMW 328i upstream wideband O2 sensor, and BMW X3/X4/X5 air-fuel ratio sensor replacement needs.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor or air-fuel ratio sensor faults
• Incorrect fuel trim readings from a worn upstream sensor
• Rough idle or hesitation caused by inaccurate mixture feedback
• Reduced fuel economy from poor air-fuel control
• Emissions test failures tied to sensor response or signal degradation

Installation Notes

Install this sensor in the upstream position only on the listed BMW applications. Verify connector shape, wire count, thread size, and harness length before installation. Because this is a wideband sensor, correct placement and secure routing of the harness are important for accurate readings and long-term reliability. Always confirm the vehicle’s engine code and original sensor configuration against the fitment list before ordering.

Quality Assurance

Bosch supplies OE-developed oxygen sensors backed by decades of engine management experience and production for vehicle manufacturers. Bosch 17272 is built to the same general OE standards used in modern emissions control systems, with durable construction and precise signal output for demanding driving conditions.