Bosch 16379 Oxygen Sensor - Downstream

Bosch 16379 Oxygen Sensor for Cadillac CTS

Bosch 16379 is an Actual OE narrow-band heated oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It is a direct replacement for the downstream position on 2003-2004 Cadillac CTS models and supports stable closed-loop fuel control.

Key Features

• Specific-fit oxygen sensor for the downstream location
• Narrow-band heated design for faster sensor warm-up and closed-loop response
• 4-wire configuration with included wiring harness
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing with high-temperature-resistant construction
• Oblong female connector with pin terminals
• Bosch Actual OE Oxygen Sensor line built from decades of OE development

Product Details

Bosch 16379 uses a switching-type sensing element to measure exhaust oxygen content and send accurate feedback to the engine control unit. Bosch’s Actual OE Oxygen Sensor line draws on the company’s long history in oxygen-sensor development, including narrowband planar designs that improve light-off speed and closed-loop operation. For 2003-2004 Cadillac CTS downstream service, this Bosch 16379 sensor provides the OE-style electrical and mechanical layout needed for direct replacement service. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Rough idle caused by inaccurate exhaust oxygen readings
• Reduced fuel control consistency during closed-loop operation
• Emissions test failures tied to a worn downstream sensor

Installation Notes

Fits 2003-2004 Cadillac CTS, downstream. Confirm the connector shape, wire count, and threaded mounting location before installation. Use the correct oxygen-sensor socket for the 22 mm hex and verify the harness routing matches the original sensor path. Bosch 16379 is a specific-fit replacement, so it should be matched to the vehicle’s downstream sensor location and original connector style.

Quality Assurance

Bosch backs this oxygen sensor with OE development experience and materials selected for heat and vibration resistance. The Bosch 16379 part number is associated with the Actual OE Oxygen Sensor line, which is engineered to deliver OE-proven sensor behavior for service replacement.