Bosch 17300 Oxygen Sensor - Upstream

Bosch Wideband O2 Sensor for OE Fitment

Bosch 17300 is an Actual OE Oxygen Sensor built as a wideband air-fuel sensor for precise mixture monitoring. It delivers continuous lambda-range feedback to the ECU, helping maintain accurate fuel control on applications such as the Cadillac CTS, Cadillac STS, and Cadillac SRX.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio measurement
• Specific fit design for direct replacement on listed Cadillac applications
• Heated sensor with optimized heater control for faster operating readiness
• 5-wire design with blade terminals and included wiring harness
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Robust metal housing for OE-style durability in high-heat exhaust locations
• Bosch 17300 is part of the Actual OE Oxygen Sensor line

Product Details

Bosch pioneered the planar pump-cell wideband sensor design that became the standard for modern engine management. This Bosch 17300 oxygen sensor uses that OE-developed approach to provide detailed feedback across the full lambda range, giving the engine control module the information it needs for accurate air-fuel adjustment under changing load and temperature conditions. It is a direct-fit, standard replacement sensor for upstream locations on select Cadillac models, including 2005-2008 Cadillac CTS, 2005-2008 Cadillac STS, and 2005-2006 Cadillac SRX.

This part cross-references GM (e.g., 12596327) for the same application.

What This Sensor Helps Address

• Check engine lights related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn upstream sensor
• Reduced fuel economy caused by inaccurate exhaust feedback
• Rough idle, hesitation, or inconsistent throttle response
• Emissions test failures tied to sensor response issues

Installation Notes and Tips

Fits 2006-2008 Cadillac CTS, upstream. Fits 2006-2007 Cadillac STS, upstream. Fits 2006 Cadillac SRX, upstream. Fits 2005 Cadillac CTS, upstream, late production with oval connector. Fits 2005 Cadillac SRX, upstream, late production with oval connector. Fits 2005 Cadillac STS, upstream, late production with oval connector. Confirm connector style, thread size, and upstream location before installation. Use the existing threaded mounting point and verify the harness routing matches the original sensor path.

Quality Assurance

Bosch backs this sensor with more than five decades of OE development and supplies aftermarket oxygen sensors built to OE-proven standards. The Actual OE Oxygen Sensor line reflects Bosch’s original wideband sensor engineering used by vehicle manufacturers.