Bosch 15146 Oxygen Sensor - Upstream

Bosch Wideband O2 Sensor for OE-Style Control

Bosch 15146 is a specific-fit wideband air/fuel oxygen sensor built for precise mixture feedback and stable engine management. It is an upstream sensor for select 2005-2006 Cadillac XLR applications, including late-production 2005 models and 2006 models.

Key Features

• Wideband A/F oxygen sensor with continuous air-fuel ratio measurement across the full lambda range
• Heated design for faster sensor activity and improved cold-start response
• Specific-fit replacement with a 36.8 in wiring harness length
• 5-wire sensor design with blade terminals and a rectangular male connector
• Threaded mounting with 18 mm thread size and 22 mm hex size
• Robust metal housing and ceramic sensor construction for demanding thermal cycles
• OE-focused Bosch Actual OE Oxygen Sensor line

Product Details

Bosch 15146 is part of the Bosch Actual OE Oxygen Sensor line, which focuses on OE-style replacement sensors engineered for accurate feedback and dependable operation. This wide band sensor provides the ECU with detailed air-fuel ratio data, helping maintain precise fuel control under changing load conditions. For Cadillac XLR owners, Bosch 15146 supports upstream exhaust monitoring on 2005 and 2006 vehicles listed in the fitment data.

This part cross-references 12597875 for the same application.

What It Helps Address

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

Installation Notes

Fits 2005 Cadillac XLR, Upstream, and fits 2006 Cadillac XLR, Upstream. Confirm the connector style, thread size, and sensor location before installation. The sensor uses a threaded mount and a 36.8 in harness, so routing should match the original path to avoid strain or heat exposure. Always verify the vehicle’s original part number and exhaust position before replacement.

Quality Assurance

Bosch has more than five decades of OE development experience and supplies oxygen sensors to the aftermarket with OE-proven design principles. Bosch 15146 is built to deliver accurate wideband feedback and reliable operation in modern engine management systems.