Bosch 16746 Oxygen Sensor - Downstream or Downstream Right

Bosch Actual OE Oxygen Sensor 16746

Bosch 16746 is a specific-fit, narrow-band heated oxygen sensor for downstream applications on select Cadillac models. It provides the ECU with accurate air-fuel-ratio feedback to support stable combustion control and lower emissions, making it a direct replacement choice for vehicles that need OE-style sensor response.

The Bosch Actual OE Oxygen Sensor line builds on Bosch’s long history in oxygen-sensor development, including early thimble-style designs and later planar narrowband technology. This sensor uses a threaded metal housing, a square connector, a 4-wire harness, and a 22 mm hex for service access.

Key Features

• Part number 16746
• Specific-fit narrow-band heated oxygen sensor
• Downstream and downstream right fitment for select Cadillac CTS, SRX, and STS models
• 4-wire design with included wiring harness
• Square male connector with female terminals
• Threaded mounting, 18 mm thread size, 22 mm hex
• Metal housing for high-temperature and vibration resistance

Product Details

Bosch 16746 is engineered for vehicles that rely on precise closed-loop fuel control after the catalytic converter. It measures exhaust oxygen content and sends that signal to the ECU so the system can adjust fueling accurately across changing operating conditions. For drivers searching for a downstream oxygen sensor for 2005-2009 Cadillac CTS, 2005-2009 Cadillac SRX, or 2005-2007 Cadillac STS, this Bosch replacement matches the listed OE-style application and connector layout. This part cross-references GM-style service numbers 12590035 and 12597449 for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Slow or inaccurate oxygen sensor signal response
• Emissions test failures tied to sensor output
• Fuel control issues caused by degraded narrow-band sensor readings
• Connector or harness mismatch on the listed Cadillac applications

Installation Notes

Verify the vehicle’s position, connector shape, and thread size before installation. This sensor uses a threaded mount with an 18 mm thread diameter and a square connector, so matching the original sensor configuration is important. For best results, inspect the exhaust bung threads and wiring routing before tightening the sensor into place.

Quality Assurance

Bosch supplies oxygen sensors with OE development experience and materials selected for heat and vibration exposure in exhaust service. The Actual OE Oxygen Sensor line is built to deliver OE-proven fit and signal behavior for the listed Cadillac CTS, SRX, and STS applications.