Bosch 17254 Oxygen Sensor - Upstream or Upstream Right

Bosch Wideband O2 Sensor for BMW X5

Bosch 17254 is an actual OE wideband air-fuel oxygen sensor built for precise mixture monitoring and stable engine management. It is a specific-fit, heated sensor with a 5-wire harness and 16-inch wiring harness length for select 2004-2006 BMW X5 upstream applications.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio measurement across the full lambda range
• Heated design for faster sensor operation and improved cold-start response
• Specific-fit replacement with oblong male connector and blade terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Robust metal housing and ceramic sensor construction for OE-style durability
• Wiring harness included for direct replacement on listed BMW X5 applications

Product Details

This Bosch Actual OE Oxygen Sensor line is based on Bosch OE development and the planar pump-cell wideband design that helped set the standard for modern engine control. Part number 17254 provides the ECU with detailed air-fuel data, allowing accurate fuel delivery control under changing load and temperature conditions. It is listed for 2004-2006 BMW X5 upstream and upstream right positions, including cylinder(s) 1 to 4 on the applicable upstream location. This part cross-references Bosch 17254 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 and Tips

Verify the connector shape, terminal count, thread size, and sensor position before installation. This Bosch 17254 is a threaded, heated wideband sensor with a specific-fit harness, so it should be matched to the exact upstream BMW X5 application listed. Use proper oxygen sensor service tools and follow factory torque specifications to avoid thread or wiring damage.

Quality Assurance

Bosch supplies OE-level oxygen sensor technology backed by more than five decades of engine management development. The Bosch 17254 is built to OE-style standards for accurate signal output, fast response, and dependable operation in demanding thermal conditions.