Delphi ES10320 Oxygen Sensor

Delphi ES10320 Oxygen Sensor Overview

The Delphi ES10320 is a non-heated upstream oxygen sensor built for specific Toyota Corolla and Geo Prizm applications. It uses a 2-wire design with a square connector and 18 x 1.5 mm thread size for direct replacement service on listed vehicles.

Delphi draws on OE experience and supplier knowledge developed through work with major automakers, bringing factory-informed engineering to this aftermarket oxygen sensor.

Key Features

• Non-heated oxygen sensor for upstream placement
• 2-wire configuration with square connector
• 18 x 1.5 mm thread size for proper mounting
• 450.0 overall length
• Includes oxygen sensor and instruction sheet
• Direct-fit application coverage for Toyota Corolla and Geo Prizm

Detailed Description

Delphi ES10320 is an upstream oxygen sensor for 1990-1993 Toyota Corolla and 1990-1992 Geo Prizm applications listed in the fitment data. It is engineered with OE-based knowledge and built to match the electrical and mechanical requirements of the original sensor location. This part number, ES10320, is a practical replacement choice when servicing emissions-related sensor faults on these vehicles.

This part cross-references Bosch 12202 and DENSO Auto Parts 234-2055 for the same application. For buyers searching Toyota Corolla oxygen sensor replacement or Geo Prizm upstream O2 sensor ES10320, this listing aligns with the confirmed vehicle coverage shown below.

What It Helps Address

• Check engine light related to upstream oxygen sensor performance
• Incorrect air-fuel feedback from a worn sensor
• Emissions test failures tied to sensor response issues
• Rough idle or drivability concerns caused by faulty exhaust feedback
• Replacement needs on 1990-1993 Toyota Corolla and 1990-1992 Geo Prizm models

Installation Notes and Tips

Install the sensor in the upstream location specified by the vehicle application. Confirm the 18 x 1.5 mm thread size, square connector shape, and 2-wire configuration before installation. On 1993 Toyota Corolla applications, this part is listed for vehicles without California Emission System. On 1990 Geo Prizm applications, the fitment note applies from chassis # LZ090311.

For best results, inspect the connector, wiring, and exhaust bung condition before installation. Verify the vehicle year and emission configuration against the fitment data for the exact Toyota Corolla or Geo Prizm application.

Quality Assurance

Delphi backs this oxygen sensor with OE heritage and manufacturing knowledge developed through decades of supplying top automakers. That background supports consistent fit, function, and application-specific replacement performance for the listed vehicles.