Delphi ES20203 Oxygen Sensor - Front

Delphi ES20203 Oxygen Sensor Overview

The Delphi ES20203 oxygen sensor is a heated, 4-wire replacement built for precise exhaust monitoring in select Hyundai and Mitsubishi applications. With OE-based engineering and a 355 mm overall length, it is a direct-fit option for front-position and rear-position applications listed below.

• Heated oxygen sensor for faster operating temperature and stable signal output
• 4-wire design with square connector shape
• 18 x 1.5 mm thread size for listed applications
• 355.0 overall length for fitment-specific replacement use
• Package contents include the oxygen sensor and instruction sheet
• Compatible with front and rear positions, depending on vehicle application

Fitment and Application Details

Compatible With 1998-1996 Hyundai Sonata, front; 1998-1997 Hyundai Sonata, front without California Emission System; 1995-1994 Hyundai Elantra, front without California Emission System; 1995-1994 Hyundai Sonata, front with California Emission System; 1995-1994 Hyundai Sonata, N/A without California Emission System; 1994 Hyundai Excel, front; 1994 Mitsubishi Precis, front with California Emission System; 1993 Hyundai Elantra, front with California Emission System; 1993 Hyundai Elantra, N/A without California Emission System; 1993 Hyundai Excel, front with California Emission System; 1993 Mitsubishi Precis, front with California Emission System.

Delphi ES20203 is engineered from OE heritage and decades of supplier experience, bringing factory-style knowledge to the aftermarket. This oxygen sensor is a practical replacement choice for Hyundai Sonata, Hyundai Elantra, Hyundai Excel, and Mitsubishi Precis applications where the listed connector, thread, and length specifications match the vehicle.

This part cross-references DENSO Auto Parts (e.g., 234-4034) and SKF (e.g., 13571) for the same application.

Common Replacement Uses

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings
• Reduced fuel control from a failing upstream or downstream sensor
• Emissions test failure tied to sensor response issues
• Rough idle or drivability concerns caused by inaccurate exhaust feedback

Installation Notes and Quality

Verify the vehicle’s position, connector shape, thread size, and overall length before installation. Use the application tab or vehicle service information to confirm whether your specific Hyundai Sonata, Hyundai Elantra, Hyundai Excel, or Mitsubishi Precis requires a front or rear sensor. The included instruction sheet provides installation guidance for the listed application.

Delphi builds this sensor using OE experience and supplier knowledge developed over many years in the automotive industry. That background supports consistent fitment and specification matching for the vehicles listed above.