Bosch 18008 Oxygen Sensor - Downstream

Bosch Oxygen Sensor for Buick Verano

Bosch Engineered Oxygen Sensor 18008 is a specific-fit, narrow-band heated O2 sensor built for precise air-fuel-ratio feedback to the ECU. It is listed for 2015-2017 Buick Verano downstream applications and uses a threaded metal housing with a trapezoid female connector and 4-wire harness.

Key Features

• Specific-fit oxygen sensor for downstream placement
• Narrow-band heated sensor design for closed-loop fuel control
• 4-wire configuration with included wiring harness
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing for high-temperature and vibration resistance
• Connector shape: trapezoid; terminal type: pin
• Part number 18008 for direct catalog identification

Product Details

Bosch 18008 is part of the Bosch Engineered Oxygen Sensor line, which builds on Bosch OE oxygen sensor development and narrowband sensor technology. Bosch uses ceramic sensing elements and controlled heater operation to deliver stable signal response and accurate lambda feedback across changing exhaust temperatures. For 2015-2017 Buick Verano downstream service, this Bosch oxygen sensor supports consistent combustion control and emissions monitoring in the original sensor location. If you are replacing a worn Buick Verano downstream O2 sensor, Bosch 18008 provides the OE-style fit and electrical layout needed for a proper repair. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Problems This Part Can Address

• Check engine light related to downstream oxygen sensor performance
• Slow or inaccurate air-fuel ratio feedback
• Rough idle or inconsistent fuel control after sensor aging
• Emissions test failure tied to oxygen sensor response
• Corrosion or heat damage at the original sensor body or connector

Installation Notes and Tips

Verify the downstream sensor location before ordering and match the connector, thread size, and harness length to the original unit. Use proper oxygen sensor service tools for removal and installation, and inspect the exhaust bung threads before tightening the new sensor. Confirm the connector locks securely and route the harness away from hot exhaust components.

Quality Assurance

Bosch has more than five decades of OE oxygen sensor development behind this replacement part. Bosch 18008 is built to the same engineering standards that support original equipment applications, with materials selected for heat and vibration resistance.