Bosch 15159 Oxygen Sensor - Downstream

Bosch Validated Oxygen Sensor for 2006 Hummer H3

Bosch Validated Oxygen Sensor 15159 is a specific-fit, narrow-band heated O2 sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management for the 2006 Hummer H3 downstream application.

Key Features

• Specific-fit oxygen sensor for direct application matching
• Narrow-band heated design for faster closed-loop operation
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• 4-wire configuration with square female connector
• Wiring harness included with 6.8 in harness length
• Metal housing with high-temperature-resistant construction
• Bosch Validated Oxygen Sensor line backed by OE development experience

Product Details

Bosch part number 15159 is a standard replacement oxygen sensor engineered for downstream use on the 2006 Hummer H3. Bosch developed its oxygen sensor technology from early thimble-style designs to planar narrowband sensors that improve light-off response, lambda accuracy, and closed-loop control speed. This sensor uses advanced ceramic elements and optimized heater control to maintain consistent signal performance under heat and vibration. If you are searching for a Bosch 15159 oxygen sensor for 2006 Hummer H3 downstream service, this unit matches the listed fitment and connector style.

This part cross-references 12596740 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Slow closed-loop response after startup
• Emissions test failures tied to downstream sensor readings
• Rough combustion control caused by degraded sensor output

Installation Notes and Tips

Fits 2006 Hummer H3, downstream. Confirm the connector shape, wire count, and threaded mounting location before installation. Use the 18 mm thread size and 22 mm hex specification to verify tool fitment, and inspect the harness routing so the sensor lead is not strained or routed against hot exhaust components. Replace the sensor only after confirming the downstream location and matching the vehicle’s original connector style.

Quality Assurance

Bosch draws on more than five decades of OE oxygen sensor development, and the Validated Oxygen Sensor line is built to the same application standards used by vehicle manufacturers. Bosch part number 15159 is produced as a standard replacement sensor with OE-proven design principles for accurate signal control and durable service.