Bosch 17275 Oxygen Sensor - Upstream

Bosch 17275 Wideband O2 Sensor Overview

Bosch 17275 is an Actual OE Oxygen Sensor built as a wideband air-fuel ratio sensor for precise engine management. It provides continuous lambda measurement so the ECU can make accurate fueling adjustments on vehicles such as the 2005-2008 Buick Allure and 2005-2008 Buick LaCrosse, upstream.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio measurement
• Heated design for faster sensor warm-up and stable operation
• Specific-fit replacement with a 5-wire harness and 6 terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing with oblong male connector and included wiring harness
• Overall length: 17.4 in; sealing surface to connector end: 16.3 in

Product Details

Bosch 17275 uses Bosch wideband sensor technology, the same design approach that helped establish the modern planar pump-cell standard for engine control systems. As an Actual OE Oxygen Sensor, it is built for direct replacement on the specified upstream location and provides the detailed feedback needed for accurate fuel control, stable drivability, and emissions management. This part cross-references GM 12587096 for the same application.

For fitment-focused searches, this Bosch oxygen sensor is the correct upstream replacement for 2005, 2006, 2007, and 2008 Buick Allure and 2005, 2006, 2007, and 2008 Buick LaCrosse applications listed in the catalog. The Bosch 17275 part number is commonly used when replacing a worn wideband sensor on these vehicles.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings at the ECU
• Rough idle or inconsistent throttle response caused by faulty sensor feedback
• Reduced fuel economy from inaccurate mixture control
• Emissions test failures tied to upstream sensor faults

Installation Notes

Verify the upstream location, connector shape, wire count, and thread size before installation. Use the 18 mm thread specification and 22 mm hex size to match the correct service tool, and confirm the harness routing matches the original layout on the Buick Allure or Buick LaCrosse application. Bosch 17275 is a specific-fit replacement, so connector and mounting details should be checked against the original sensor before installation.

Quality Assurance

Bosch has more than five decades of OE development in oxygen sensor technology, and this Actual OE Oxygen Sensor reflects that experience in a durable, OE-style replacement for modern engine management systems. Bosch 17275 is engineered for reliable wideband signal control under changing load and temperature conditions.