Delphi ES20409 Oxygen Sensor - Rear, Rear Left or Rear Right

Rear Oxygen Sensor for Ford, Lincoln, and Mazda

Delphi ES20409 is a heated oxygen sensor built for rear exhaust monitoring on select Ford, Lincoln, and Mazda applications. It uses a 4-wire design with a square connector and 18 x 1.5 mm thread size for direct-fit replacement on listed vehicles.

Key Features

• Heated oxygen sensor for rear-position exhaust feedback
• 4-wire configuration with square connector shape
• 18 x 1.5 mm thread size
• Overall length: 345.0
• Package contents: oxygen sensor and instruction sheet
• OE-backed engineering from Delphi, built on more than 100 years of original equipment experience

Detailed Description

Delphi ES20409 is an emission control sensor for rear, rear left, and rear right locations, depending on vehicle application. It is engineered for select Ford Explorer, Ford Flex, Ford Taurus, Lincoln MKT, Lincoln MKS, Lincoln MKX, Mazda CX-9, Mazda 6, Ford Edge, Ford Fusion, Lincoln MKZ, and Mercury Milan applications. This part cross-references DENSO Auto Parts 234-4489 and Gates 22134 for the same application. Delphi’s OE heritage and supplier experience are reflected in the sensor design and application coverage.

Vehicle Fitment

• Fits 2013-2019 Ford Explorer, rear left.
• Fits 2011-2019 Ford Flex, rear left.
• Fits 2011-2019 Ford Taurus, rear left.
• Fits 2011-2019 Lincoln MKT, rear left.
• Fits 2011-2016 Lincoln MKS, rear left.
• Fits 2011-2015 Lincoln MKX, rear.
• Fits 2011-2015 Mazda CX-9, rear.
• Fits 2011-2014 Ford Edge, rear.
• Fits 2011-2013 Mazda 6, rear.
• Fits 2011-2012 Ford Explorer, rear.
• Fits 2011-2012 Ford Flex, rear.
• Fits 2011-2012 Ford Fusion, rear.
• Fits 2011-2012 Ford Fusion, rear right.
• Fits 2011-2012 Ford Taurus, rear.
• Fits 2011-2012 Lincoln MKS, rear.
• Fits 2011-2012 Lincoln MKT, rear.
• Fits 2011-2012 Lincoln MKZ, rear.
• Fits 2011 Mercury Milan, rear right.

Installation Notes and Tips

Confirm the exact rear sensor position for your vehicle before ordering, since this part is listed for rear, rear left, and rear right applications. Match the square connector, 4-wire layout, and 18 x 1.5 mm thread size to the original sensor before installation. Verify the application tab for the correct placement on Ford Explorer, Ford Flex, and Lincoln MKT models.

Quality Assurance

Delphi builds this oxygen sensor using OE experience and application knowledge developed through long-term original equipment supply. That background supports consistent fitment and sensor design for listed Ford, Lincoln, and Mazda rear exhaust applications.