Delphi ES10421 Oxygen Sensor

Delphi ES10421 Oxygen Sensor for Honda Civic

Delphi ES10421 is a non-heated oxygen sensor built for front-position applications on select Honda Civic models. It uses a square connector, 18 x 1.5 mm thread size, and a 375.0 overall length to match the original-style fitment for the listed vehicles.

Backed by Delphi’s OE heritage and decades of supplier experience with major automakers, this oxygen sensor is built with the application details needed for a direct replacement on 1992-1995 Honda Civic models without California Emission System coverage.

Key Features

• Part number: ES10421
• Non-heated oxygen sensor design
• Front position fitment
• Square connector shape
• 18 x 1.5 mm thread size
• Overall length: 375.0
• Includes oxygen sensor and instruction sheet
• Fits 1992 Honda Civic, front
• Fits 1993 Honda Civic, front, without California Emission System - 3 Door
• Fits 1994-1995 Honda Civic, front, without California Emission System

Detailed Description

Delphi ES10421 is an emission control oxygen sensor for Honda Civic applications that require a front-mounted, non-heated sensor. The square connector and specified thread size help support proper electrical and mechanical fit, while the OE-focused design reflects Delphi’s long history supplying components to top automakers. This part number, ES10421, is a direct replacement option for select 1992-1995 Honda Civic vehicles without California Emission System coverage.

This part cross-references Dorman - HELP 13947 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings
• Reduced fuel economy caused by faulty sensor feedback
• Emissions test failures tied to sensor output
• Rough engine operation from inaccurate exhaust oxygen data

Installation Notes and Tips

Verify the vehicle is a 1992-1995 Honda Civic without California Emission System coverage before ordering. Confirm the front sensor location, square connector style, and 18 x 1.5 mm thread size against the original part. Use the included instruction sheet during installation, and inspect the harness routing and connector condition before final assembly.

Quality Assurance

Delphi builds this oxygen sensor with OE experience and application-specific engineering informed by its supplier history with major automakers. That background supports consistent fitment and replacement confidence for the listed Honda Civic applications.