Delphi ES20039 Oxygen Sensor - Front or Rear

Delphi ES20039 Oxygen Sensor for Ford and Mazda

The Delphi ES20039 is a heated oxygen sensor built for rear and front applications on select Ford, Mazda, and Mercury vehicles. With OE-based engineering and a 4-wire design, it supports accurate exhaust monitoring for vehicles such as the Ford Ranger, Ford Explorer, and Mazda B4000.

Key Features

• Heated oxygen sensor for faster operating temperature and stable signal output
• 4-wire configuration with round connector shape
• 18 x 1.5 mm thread size for the listed applications
• 765.0 overall length for position-specific fitment
• Package contents include the oxygen sensor and instruction sheet
• Compatible with front and rear positions where listed by application

Detailed Description

Delphi ES20039 is an emission control sensor engineered from more than a century of OE experience and supplier knowledge. It is a direct-fit oxygen sensor for a wide range of Ford Ranger rear oxygen sensor applications, Ford Explorer rear and front oxygen sensor applications, and Mazda B3000 and Mazda B4000 rear oxygen sensor applications. It also covers select Ford Escape, Ford Focus, Ford Escort, and Mercury Tracer rear applications. This part cross-references Bosch 13117 and DENSO Auto Parts 234-4070 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings from a worn sensor
• Reduced exhaust feedback accuracy for engine management
• Slow sensor response caused by age or contamination
• Emission test failures tied to faulty upstream or downstream monitoring

Installation Notes and Tips

Verify the exact position before ordering, since this part is listed for both front and rear locations depending on vehicle application. Confirm the 18 x 1.5 mm thread size, 4-wire connector layout, and 765.0 overall length against the original sensor. Use the vehicle application details for the correct Ford Ranger, Ford Explorer, Mazda B3000, Mazda B4000, or related fitment.

Quality Assurance

Delphi builds this oxygen sensor using OE heritage and application knowledge developed through long-term supplier experience with major automakers. That background supports consistent fitment and sensor construction for the listed Ford and Mazda applications.