Bosch 16552 Oxygen Sensor - Upstream

Bosch Actual OE Oxygen Sensor for GM Applications

Bosch Part Number 16552 is a specific-fit, narrow-band heated oxygen sensor built for upstream placement on select Cadillac and Chevrolet models. It provides the ECU with accurate air-fuel ratio feedback for stable closed-loop fuel control and emissions monitoring.

Compatible With 2010-2019 Cadillac CTS, upstream; 2013-2019 Cadillac ATS, upstream; and 2010-2015 Chevrolet Camaro, upstream. Bosch 16552 is an OE-style replacement for drivers searching for an upstream oxygen sensor for Cadillac ATS, Cadillac CTS, or Chevrolet Camaro applications.

Key Features

• Specific-fit Bosch Actual OE Oxygen Sensor
• Narrow-band heated design for faster sensor warm-up
• 4-wire configuration with female connector and pin terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included with trapezoid connector shape
• Metal housing with high-temperature-resistant construction
• Upstream sensor position for closed-loop fuel control

Product Details

Bosch 16552 uses a switching-type oxygen sensing element to measure exhaust oxygen content and send precise feedback to the engine control unit. Bosch developed this sensor line from its original OE oxygen sensor technology and later planar narrowband designs, focusing on faster light-off, improved lambda accuracy, and quicker transition into closed-loop operation. For vehicles such as the Cadillac ATS, Cadillac CTS, and Chevrolet Camaro, that means dependable upstream signal response under changing load and temperature conditions.

This part cross-references Monroe Shocks & Struts (e.g., 12616201, 12634062) for the same application.

What It Helps Address

• Check engine light related to upstream oxygen sensor performance
• Rich or lean fuel trim readings caused by inaccurate O2 feedback
• Delayed closed-loop operation after cold start
• Emissions test failures tied to sensor response issues
• Rough idle or unstable combustion control from faulty air-fuel ratio data

Installation Notes

Verify the upstream location, connector shape, wire count, and 18 mm thread size before installation. Use the vehicle’s existing harness routing and confirm the sensor seats fully in the threaded bung before tightening to specification. Bosch 16552 is a direct-fit replacement for the listed Cadillac and Chevrolet applications, including 2013-2019 Cadillac ATS, 2010-2019 Cadillac CTS, and 2010-2015 Chevrolet Camaro.

Quality Assurance

Bosch backs this oxygen sensor line with more than five decades of OE development and supplies aftermarket parts built to OE-proven standards. The Actual OE Oxygen Sensor line is engineered for consistent performance in high-heat, high-vibration exhaust environments.