Bosch 15752 Oxygen Sensor - Downstream

Bosch Validated Oxygen Sensor for Ford and Mercury

Bosch 15752 is a narrow-band heated oxygen sensor built for specific downstream applications on select Ford Escape and Mercury Mariner models. It provides accurate air-fuel-ratio feedback to the ECU, helping maintain stable combustion control and lower emissions.

The Bosch Validated Oxygen Sensor line reflects Bosch OE development experience, with sensor designs that focus on fast response, reliable heater control, and durable operation in high-heat, high-vibration environments.

Key Features

• Specific-fit downstream oxygen sensor for select Ford Escape and Mercury Mariner applications
• Narrow-band heated O2 sensor for closed-loop fuel control
• 4-wire design with blade terminals and round connector
• Threaded mounting with 18 mm thread size and 22 mm hex size
• Wiring harness included for direct replacement use
• Metal housing and steel finish for underbody durability
• Bosch part number 15752 for easy identification

Detailed Description

Bosch 15752 is a standard replacement oxygen sensor engineered for downstream placement on 2005-2008 Ford Escape and 2006-2008 Mercury Mariner models. As a narrow-band heated sensor, it monitors exhaust oxygen content and sends precise signals to the engine control unit so the fuel system can maintain the correct air-fuel ratio during normal operation. Bosch’s validated oxygen sensor line builds on decades of OE sensor development, using ceramic sensing elements, controlled heater performance, and heat-resistant materials to support consistent signal output over time. If you are replacing a worn downstream sensor on a Ford Escape or Mercury Mariner, Bosch 15752 offers the fitment and electrical configuration needed for a direct service replacement.

This part cross-references Bosch 15752 for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Slow or inaccurate oxygen sensor signal response
• Fuel control issues caused by degraded exhaust feedback
• Emissions test failures tied to sensor aging or contamination
• Rough combustion control from incorrect air-fuel ratio data

Installation Notes and Tips

Fits 2005-2008 Ford Escape, downstream. Fits 2006-2008 Mercury Mariner, downstream. Confirm the sensor position and connector style before installation, and inspect the harness routing for heat damage or corrosion. Use the threaded mounting point and correct 18 mm thread specification during replacement, and verify the connector seats fully after installation.

Quality Assurance

Bosch draws on more than five decades of OE oxygen sensor development, and the Validated Oxygen Sensor line is built to meet the demands of everyday aftermarket service with OE-proven design principles.