NTK 24388 Air / Fuel Ratio Sensor - Upstream

NTK Direct Fit Air/Fuel Ratio Sensor

NTK Part Number 24388 is a direct fit heated air/fuel ratio sensor for specific upstream applications. It is built for the Bank 1 Sensor 1 position on select Ford, Mazda, and Mercury vehicles, including the Ford Escape, Ford Fusion, Mazda Tribute, Mercury Mariner, and Mercury Milan.

As part of NTK’s Direct Fit 5-Wire A/F Sensor line, this sensor is engineered for OE-style replacement on import and domestic applications. NTK uses ceramic-based sensor technology and extensive manufacturing testing to support fit, form, and function that align with original equipment requirements.

Key Features

• Direct fit replacement air/fuel ratio sensor
• Heated sensor design for upstream exhaust placement
• 5-wire configuration
• Specific fit for targeted vehicle applications
• 18.000 mm thread diameter with 0.38 thread length
• 16.5 wiring harness length
• No mounting bracket included

Detailed Description

NTK 24388 is a heated upstream air/fuel ratio sensor for Bank 1 Sensor 1 service on 2010-2012 Ford Escape, 2010-2012 Ford Fusion, 2010-2011 Mazda Tribute, 2010-2011 Mercury Mariner, and 2010-2011 Mercury Milan. This sensor is built as a specific-fit replacement, making it a practical choice when servicing the original sensor location and connector style. The NTK Direct Fit 5-Wire A/F Sensor line is backed by NTK’s OE-focused manufacturing approach and broad application coverage.

This part cross-references Bosch 18088 and DENSO Auto Parts 234-5039 for the same application.

Common Problems This Sensor Can Address

• Check engine light related to upstream air/fuel ratio sensor faults
• Rough idle or unstable air-fuel control from a failing Bank 1 Sensor 1 unit
• Incorrect fuel trim readings caused by sensor response issues
• Emissions test failures tied to oxygen sensor performance
• Driveability concerns from degraded heated sensor operation

Installation Notes and Tips

Verify the connector, thread size, and upstream Bank 1 Sensor 1 location before installation. This sensor uses a 5-wire heated design and a specific fit layout, so matching the original routing and harness length is important for proper installation. Confirm the vehicle application by year, make, model, and position before replacing the sensor.

Quality Assurance

NTK manufactures oxygen and air/fuel ratio sensors with OE-level application support and tests them during production to help ensure quality and reliability that meet or exceed original equipment specifications.