Bosch 16734 Oxygen Sensor - Upstream

Bosch Actual OE Oxygen Sensor for Volt and ELR

Bosch Part Number 16734 is an Actual OE Oxygen Sensor built for precise air-fuel-ratio feedback to the ECU. It is a narrow-band heated upstream sensor for specific-fit applications, including 2011-2015 Chevrolet Volt and 2014-2016 Cadillac ELR models.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Part Number 16734 for direct reference
• Narrow-band heated sensor design
• Specific fit with threaded mounting
• 4-wire configuration with oblong male connector
• 18 mm thread size and 22 mm hex size
• Wiring harness included with 18.7 in harness length

Product Details

Bosch 16734 uses a switching-type oxygen sensing design to deliver accurate exhaust feedback under changing engine conditions. Bosch developed its oxygen sensor technology from early OE thimble designs to planar narrowband construction, focusing on faster light-off, improved lambda accuracy, and quicker closed-loop operation. For drivers searching for a Bosch 16734 oxygen sensor for 2011-2015 Chevrolet Volt upstream or a Bosch 16734 oxygen sensor for 2014-2016 Cadillac ELR upstream, this part matches the confirmed OE-style application and mounting requirements.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Unstable air-fuel ratio feedback to the ECU
• Delayed closed-loop fuel control after startup
• Emissions test failures tied to sensor performance
• Rough combustion control caused by inaccurate exhaust readings

Installation Notes and Tips

Install this sensor in the upstream position only for the listed vehicles. Verify the 18 mm thread size, threaded mounting style, 4-wire connector layout, and oblong male connector before installation. The sensor is heated and includes the wiring harness, so routing and connector alignment should be checked carefully to avoid strain on the lead and to ensure a secure electrical connection.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development and aftermarket supply experience. The sensor uses high-temperature-resistant materials, ceramic sensing elements, and controlled heater operation to maintain consistent performance in demanding thermal and vibration conditions.