Bosch 16451 Oxygen Sensor

Bosch OE Oxygen Sensor for GM Applications

Bosch 16451 is an Actual OE Oxygen Sensor built for precise air-fuel ratio feedback to the ECU. It uses a narrow-band heated design with a 4-wire harness, square connector, and threaded mounting for direct replacement service on select Chevrolet, GMC, Buick, and Cadillac vehicles.

For drivers searching for a Bosch oxygen sensor for 2015-2020 Chevrolet Impala upstream or downstream, or a Bosch 16451 oxygen sensor for 2013-2019 Cadillac XTS, this part delivers OE-style signal control and stable closed-loop operation across changing exhaust temperatures.

Key Features

• Bosch Actual OE Oxygen Sensor, part number 16451
• Narrow-band heated sensor for faster light-off and closed-loop response
• 4-wire design with included wiring harness
• Square connector, male connector gender, female terminal gender
• Threaded mount with 18 mm thread diameter and 22 mm hex size
• Standard replacement grade for specific-fit applications
• Steel finish with metal housing for high-temperature service

Product Details

Bosch 16451 is engineered as a switching-type oxygen sensor that reports exhaust oxygen content to the engine control unit so fuel delivery can be adjusted accurately. Bosch’s OE development history includes early thimble-style sensors and later planar narrowband designs, and this sensor reflects that experience with ceramic sensing elements, controlled heater operation, and materials selected for heat and vibration resistance. It is a direct-fit solution for select GM platforms including Chevrolet Impala, Cadillac XTS, Buick Enclave, Chevrolet Traverse, GMC Acadia, GMC Canyon, Chevrolet Colorado, and Chevrolet Camaro. This part cross-references 12634085 and 12640453 for the same application.

What It Helps Address

• Fault codes related to oxygen sensor response or signal range
• Rough idle or unstable fuel control from inaccurate exhaust feedback
• Increased emissions from delayed closed-loop operation
• Poor fuel trim correction caused by a worn narrow-band sensor
• Driveability issues tied to upstream or downstream sensor degradation

Installation Notes

Verify the connector shape, wire count, thread size, and sensor position before installation. This Bosch 16451 oxygen sensor is specific fit, so match the upstream, downstream, downstream left, or downstream right location exactly to the vehicle listing. Inspect the exhaust bung threads and wiring routing before tightening the sensor to the specified threaded mount.

Quality Assurance

Bosch supplies OE-proven oxygen sensor technology to the aftermarket, drawing on more than five decades of original equipment development. The Bosch 16451 is built to the same functional standards expected from an Actual OE Oxygen Sensor for consistent signal accuracy and durable service in demanding exhaust conditions.