Bosch 18113 Oxygen Sensor - Upstream or Upstream Left

Bosch Wideband Oxygen Sensor for OE Fitment

Bosch Validated Oxygen Sensor 18113 is a specific-fit wideband A/F oxygen sensor built for precise air-fuel ratio measurement across the full lambda range. It is a heated, 5-wire sensor with a square male connector, blade terminals, and included wiring harness for direct replacement on supported Ford, Mazda, and Mercury applications.

For drivers searching for a 2010-2012 Ford Escape upstream oxygen sensor, a 2010-2012 Ford Fusion upstream O2 sensor, or a 2015 Ford Transit-150 upstream left wideband sensor, Bosch 18113 provides OE-style fitment and sensor control. The Bosch Validated Oxygen Sensor line focuses on accurate signal delivery and dependable operation in modern engine management systems.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio monitoring
• Heated design for faster light-off and stable operation
• Specific fit for direct application matching
• 5-wire configuration with 8 terminals
• Square male connector with blade terminals
• Threaded mounting with 18 mm thread diameter
• Metal housing with steel finish
• Wiring harness included
• Overall length: 20.5 in; harness length: 16.9 in

Detailed Description

Bosch 18113 is a wide band oxygen sensor engineered to provide the ECU with detailed feedback for air-fuel control, especially during changing load conditions and thermal cycling. Bosch pioneered the planar pump-cell wideband design used in modern engine management, and this sensor reflects that OE development background with robust ceramic construction, optimized heater control, and fast response characteristics. It is a standard replacement part for vehicles that require a wideband upstream sensor, including Ford Fusion, Ford Escape, Mazda Tribute, and Mercury Milan applications listed in the fitment data.

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

What It Helps Address

• Fault codes related to upstream oxygen sensor performance
• Rough idle or inconsistent air-fuel mixture control
• Reduced fuel economy caused by inaccurate sensor feedback
• Emissions test failures tied to sensor response issues
• Driveability concerns during acceleration or load changes

Installation Notes and Tips

Verify connector shape, terminal count, thread size, and sensor position before installation. This sensor uses an 18 mm thread diameter, a 22 mm hex size, and a threaded mount. Confirm the vehicle calls for an upstream left or upstream wideband sensor as listed in the fitment data. For best results, inspect the harness routing and connector condition before connecting the new sensor.

• Fits 2015 Ford Transit-150, Upstream Left
• Fits 2015 Ford Transit-250, Upstream Left
• Fits 2015 Ford Transit-350, Upstream Left
• Fits 2015 Ford Transit-350 HD, Upstream Left
• Fits 2013 Ford Fusion, Upstream
• Fits 2010-2012 Ford Escape, Upstream
• Fits 2010-2012 Ford Fusion, Upstream
• Fits 2009-2011 Mazda Tribute, Upstream
• Fits 2010-2011 Mercury Mariner, Upstream
• Fits 2010-2011 Mercury Milan, Upstream

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development experience and aftermarket supply built around OE-proven engineering. Bosch Validated Oxygen Sensor 18113 is manufactured for accurate signal output, reliable heater performance, and durable operation in demanding exhaust environments.