Bosch 18124 Oxygen Sensor - Downstream, Upstream, Upstream Left or Upstream Right

Bosch Validated Oxygen Sensor for Ford and Mercury

Bosch 18124 is a narrow-band heated oxygen sensor built for specific Ford, Mercury, Mazda, and Lincoln applications. It provides the ECU with air-fuel-ratio feedback needed for stable combustion control and emissions management across changing operating conditions.

For drivers searching for a Bosch oxygen sensor for Ford Fiesta, Fusion, Escape, or F-250 Super Duty applications, this Bosch Validated Oxygen Sensor line focuses on OE-style fit and signal accuracy. Part number 18124 is also listed for select Mercury Milan and Mariner models, plus Mazda Tribute and Lincoln Zephyr coverage.

Key Features

• Bosch Validated Oxygen Sensor, part number 18124
• Narrow-band heated oxygen sensor with 4-wire configuration
• Specific-fit design with threaded mounting
• Round male connector with blade terminals
• Wiring harness included for direct replacement use
• Metal housing with high-temperature-resistant construction
• 22 mm hex size and 18 mm thread diameter
• Designed for upstream and downstream positions on listed vehicles

How Bosch Validated Sensors Work

Bosch developed its oxygen sensor technology over decades of OE engineering, starting with early sensor designs and later advancing to planar narrowband construction for faster light-off and quicker closed-loop operation. The 18124 sensor uses a heated ceramic sensing element and controlled heater operation to deliver consistent signal response under heat and vibration. That makes it a practical replacement for emissions-related service on 2005-2019 Ford Fiesta, 2006-2010 Fusion, 2005-2010 Escape, and related applications.

This part cross-references ZZC318861 for the same application.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Rough idle caused by inaccurate air-fuel feedback
• Fuel trim issues from slow or unstable sensor response
• Emissions test failures tied to sensor degradation
• Delayed closed-loop operation after startup

Installation Notes and Fitment

Compatible with specific upstream and downstream locations only; verify the exact position before ordering. Fits 2011-2019 Ford Fiesta, downstream. Fits 2014-2018 Ford Fiesta, upstream with 4 pin connector. Fits 2011-2013 Ford Fiesta, upstream. Fits 2005-2010 Ford Escape, upstream. Fits 2005-2010 Ford F-250 Super Duty, upstream. Fits 2005-2010 Ford F-350 Super Duty, upstream. Fits 2006-2010 Ford Fusion, upstream. Fits 2007-2009 Ford Fusion, upstream right. Fits 2007-2009 Ford Fusion, upstream left. Fits 2005-2009 Mercury Mariner, upstream. Fits 2007-2009 Mercury Milan, upstream right. Fits 2007-2009 Mercury Milan, upstream left. Fits 2006-2009 Mercury Milan, upstream. Fits 2005-2008 Ford E-150, upstream. Fits 2005-2008 Ford E-250, upstream. Fits 2005-2008 Ford E-350 Super Duty, upstream. Fits 2008 Mazda Tribute, upstream. Fits 2005-2006 Mazda Tribute, upstream. Fits 2006 Lincoln Zephyr, upstream. Fits 2005 Ford E-150 Club Wagon, upstream. Fits 2005 Ford E-350 Club Wagon, upstream.

Before installation, confirm the connector style, thread size, and sensor position against the original unit. Use proper oxygen sensor service tools to avoid damaging the threaded bung or harness during removal and installation.

Quality Assurance

Bosch backs this oxygen sensor with OE development experience and validated aftermarket coverage. The design uses durable materials and heater control strategies intended to maintain accurate operation in demanding thermal and vibration conditions.