Delphi ES20377 Oxygen Sensor - Rear, Rear Left or Rear Right

Delphi ES20377 Rear Oxygen Sensor

Delphi ES20377 is a heated oxygen sensor built for rear-position exhaust monitoring on select Jaguar and Volvo applications. It uses a 4-wire design, square connector, and 18 x 1.5 mm thread size to match the specified OE-style fitment.

Backed by Delphi’s OE heritage and decades of supplier experience, this oxygen sensor is built with the application details needed for accurate replacement on vehicles such as the Jaguar XK, XKR, and Volvo XC90.

Key Features

• Heated oxygen sensor for rear exhaust placement
• 4-wire configuration with square connector shape
• Thread size: 18 x 1.5 mm
• Overall length: 905.0
• Includes oxygen sensor and instruction sheet
• Fits rear, rear left, and rear right positions depending on vehicle application

Application Details

Compatible With select 2002-2015 Jaguar and Volvo models, this Delphi ES20377 oxygen sensor covers rear-position applications across the Jaguar XK, XKR, XKR-S, XF, XFR, and XJ, plus Volvo XC90, S80, V70, S40, S60, and V50 listings. For the exact position on your vehicle, refer to the application tab before ordering.

This part cross-references DENSO Auto Parts (e.g., 234-4450, 234-4451) for the same application.

What It Helps Address

• Check engine light related to rear oxygen sensor performance
• Incorrect exhaust oxygen readings from a worn sensor
• Fuel control issues caused by delayed sensor response
• Emissions test failures tied to rear sensor faults
• Replacement needs after sensor aging, contamination, or wiring wear

Installation Notes and Tips

Confirm the connector shape, wire count, thread size, and sensor position before installation. This ES20377 is listed for rear, rear left, and rear right locations depending on the vehicle, including Jaguar XF and XFR applications with chassis-specific notes and Volvo XC90 rear-position listings. Compare the original sensor routing and connector style to the vehicle’s OE part before installation.

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 design and application matching of ES20377 for rear oxygen sensor replacement.