Bosch 15724 Oxygen Sensor

Bosch Oxygen Sensor for Downstream Control

Bosch 15724 is a specific-fit narrow-band heated oxygen sensor for downstream applications on select Ford, Lincoln, Mazda, and Mercury vehicles. It provides the ECU with air-fuel-ratio feedback needed for stable combustion control and emissions monitoring.

Built on Bosch Engineered Oxygen Sensor technology, this replacement uses a threaded metal housing, 4-wire blade terminals, and an included wiring harness for direct-fit service on the listed applications.

Key Features

• Specific-fit Bosch oxygen sensor for downstream locations
• Narrow-band heated O2 sensor design for closed-loop operation
• 4-wire configuration with blade terminals and round connector
• Threaded mounting with 18 mm thread size and 22 mm hex
• Wiring harness included for the listed vehicle applications
• Standard replacement grade for emission control service
• Overall length: 20.1 in; harness length: 16.4 in

Product Details

Bosch Part Number 15724 is engineered for downstream oxygen sensor service where accurate exhaust-gas feedback is needed after the catalytic converter. Bosch’s OE development history includes early thimble-style sensors and later planar narrowband designs, and this sensor reflects that experience with fast heater response, stable lambda measurement, and durable ceramic construction. It is a direct replacement for select Ford Edge, Ford Escape, Ford Fusion, Ford Taurus, Lincoln MKX, Lincoln MKZ, Mazda Tribute, and Mercury Mariner applications, including downstream left, downstream right, downstream rear, and downstream positions where listed. This part cross-references AJ0518861B and ZZD118860 for the same application.

Common Problems This Sensor Can Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Emissions test failure caused by sensor signal issues
• Rough or unstable combustion control after catalyst monitoring faults
• Slow sensor response from a worn heated narrow-band O2 sensor

Installation Notes and Tips

Verify the exact position before ordering, since this Bosch 15724 sensor is listed for specific downstream locations only. Confirm the 18 mm thread size, 22 mm hex, 4-wire layout, and connector style against the original sensor before installation. Inspect the exhaust bung threads and wiring routing, and transfer the sensor carefully to avoid damage to the sensing element or harness.

Quality Assurance

Bosch supplies oxygen sensors backed by more than five decades of OE development and aftermarket application experience. The Bosch Engineered Oxygen Sensor line is built to OE-proven standards for accurate signal delivery, heater control, and durability under heat and vibration.

Compatible With 2014 Lincoln MKS, downstream left; 2010-2012 Lincoln MKS, downstream left; 2013 Lincoln MKS, downstream front; 2010-2011 Lincoln MKT, downstream right; 2009-2011 Mazda Tribute, downstream; 2007-2010 Ford Edge, downstream; 2007-2010 Ford Escape, downstream rear; 2009-2010 Ford Escape, downstream; 2009-2010 Ford Flex, downstream; 2010 Ford Flex, downstream right; 2007-2010 Ford Fusion, downstream right; 2010 Ford Fusion, downstream; 2008-2010 Ford Taurus, downstream; 2009-2010 Lincoln MKS, downstream; 2010 Lincoln MKS, downstream right; 2010 Lincoln MKT, downstream; 2010 Lincoln MKT, downstream left; 2007-2010 Lincoln MKX, downstream; 2007-2010 Lincoln MKZ, downstream; 2009-2010 Mercury Mariner, downstream; 2007-2010 Mercury Mariner, downstream rear; 2010 Mercury Milan, downstream; 2008-2009 Ford Taurus X, downstream; 2007-2009 Mercury Milan, downstream right; 2008-2009 Mercury Sable, downstream; 2005-2007 Ford Five Hundred, downstream left; 2005-2007 Ford Freestyle, downstream left; 2006-2007 Mercury Montego, downstream left; 2001-2006 Ford Escape, downstream left; 2005-2006 Mercury Mariner, downstream left; 2005 Mercury Montego, downstream left; 2001-2004 Mazda Tribute, downstream left.