Delphi ES20407 Oxygen Sensor - Rear, Rear Left or Rear Right

OE-Style Rear Oxygen Sensor for Ford and Lincoln

The Delphi ES20407 is a heated oxygen sensor built for rear sensor locations on select Ford, Lincoln, and Mercury vehicles. It combines OE heritage with application-specific fitment for accurate exhaust monitoring on models such as the Ford Explorer, Ford Flex, Ford Taurus, and Lincoln MKZ.

Key Features

• Heated oxygen sensor for rear, rear left, and rear right positions
• 4-wire design with square connector shape
• 18 x 1.5 mm thread size for direct-fit installation on listed applications
• Overall length: 475.0
• Includes oxygen sensor and instruction sheet
• Built from Delphi OE experience and supplier knowledge

Detailed Description

Delphi ES20407 is an emission control oxygen sensor engineered for rear exhaust monitoring on a wide range of Ford and Lincoln applications. It is listed for the rear position on 2011-2014 Ford F-150 and 2011-2014 Ford Mustang, plus rear left and rear right positions on vehicles including the 2013-2016 Lincoln MKZ, 2013-2015 Ford Explorer, 2013-2015 Ford Flex, 2013-2015 Ford Taurus, and 2013-2015 Lincoln MKS. This part number also covers select 2011-2012 Ford Escape, Ford Fusion, Lincoln MKZ, Mercury Mariner, and Mercury Milan rear sensor locations.

Delphi ES20407 cross-references DENSO Auto Parts 234-4490 and 234-4491 for the same application. The OE-style design supports accurate exhaust feedback on vehicles such as the Ford Explorer and Lincoln MKZ when replacing a worn rear oxygen sensor.

Common Problems This Part Can Address

• Check engine light related to rear oxygen sensor performance
• Fault codes tied to slow or inaccurate exhaust readings
• Rough emissions monitoring after sensor aging or contamination
• Failed inspection results caused by a faulty rear O2 sensor
• Reduced fuel control feedback from the exhaust system

Installation Notes and Tips

Confirm the exact position before ordering, since this sensor is listed for rear, rear left, and rear right locations depending on vehicle application. Verify connector shape, wire count, and thread size against the original sensor before installation. For best results, compare the vehicle application tab with your VIN and build date, especially on 2016 Lincoln MKS models noted as valid only to 12/07/2015.

Quality Assurance

Delphi draws on more than 100 years of OE experience and supplier knowledge used by major automakers. That OE background is reflected in the ES20407 design and application coverage for Ford, Lincoln, and Mercury rear oxygen sensor replacement needs.