Delphi ES20403 Oxygen Sensor - Rear

Delphi ES20403 Rear Oxygen Sensor

The Delphi ES20403 is a heated rear oxygen sensor built for precise exhaust monitoring on select Honda applications. It combines OE heritage with a 4-wire design, square connector shape, and 18 x 1.5 mm thread size for a direct-fit replacement on the listed vehicles.

Key Features

• Heated oxygen sensor for rear exhaust placement
• 4-wire configuration for signal and heater circuit operation
• Square connector shape for the specified application
• 18 x 1.5 mm thread size
• Overall length: 620.0
• Includes oxygen sensor and instruction sheet
• Delphi ES20403 built with OE experience and aftermarket knowledge

Application Details

Compatible With 2006-2011 Honda Civic, rear. This Delphi ES20403 oxygen sensor is specified for rear position use on the Honda Civic across the 2006, 2007, 2008, 2009, 2010, and 2011 model years. It is also cross-referenced to DENSO Auto Parts 234-4358 for the same application.

What It Helps Address

• Check engine light concerns related to rear oxygen sensor performance
• Incorrect exhaust oxygen readings from a worn sensor
• Fuel control issues caused by degraded sensor response
• Emissions test failures tied to sensor output problems
• Replacement needs after sensor aging, contamination, or heater circuit faults

Installation Notes

Verify the connector shape, wire count, thread size, and rear position before installation. The Delphi ES20403 is a direct replacement for the listed Honda Civic applications, and the included instruction sheet can help confirm routing and fitment details during service.

Quality Assurance

Delphi draws on more than a century of OE experience and supplier knowledge used by major automakers. That OE heritage is reflected in the design and engineering of this rear oxygen sensor for the listed Honda Civic fitment.