Delphi ES20035 Oxygen Sensor - Front or Rear

Delphi ES20035 Oxygen Sensor Overview

The Delphi ES20035 is a heated oxygen sensor built for emission control service on select Toyota applications. It uses a 4-wire design, a square connector, and an 18 x 1.5 mm thread size to match the original-style fit and electrical connection required for accurate exhaust feedback.

With Delphi’s OE heritage and decades of supplier experience, this oxygen sensor is built with the application details needed for direct replacement service on Toyota Pickup and Toyota Van models listed below.

Key Features

• Heated oxygen sensor for faster operating temperature and signal response
• 4-wire configuration for the specified vehicle applications
• Square connector shape for OE-style connection fitment
• 18 x 1.5 mm thread size for proper exhaust bung engagement
• Overall length: 580.0
• Package contents: oxygen sensor and instruction sheet
• Position coverage: front and rear, depending on vehicle application

Detailed Description

Delphi ES20035 is an emission control sensor engineered for vehicles that rely on precise oxygen monitoring to manage fuel delivery and exhaust performance. This part number is listed for 1989-1991 Toyota Pickup rear applications, including California Emission System and optional configurations, as well as 1989 Toyota Van front and 1988 Toyota Van N/A listings. If you are searching for a Delphi ES20035 oxygen sensor for Toyota Pickup or Toyota Van service, verify the exact position in the application tab before ordering.

This part cross-references DENSO Auto Parts 234-4055 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings
• Reduced fuel control from a slow or aging sensor
• Emission test failures tied to sensor output
• Rough idle or drivability issues caused by inaccurate exhaust feedback

Installation Notes and Tips

Confirm the vehicle year, make, model, and sensor position before installation. The listed fitment includes rear and front positions depending on the Toyota application, so match the original sensor location and connector style before replacing the part. Use the thread size and overall length as reference points during comparison with the removed sensor.

Fits 1989-1991 Toyota Pickup, rear; fits 1989 Toyota Van, front; fits 1988 Toyota Van, N/A. For Toyota Pickup and Toyota Van applications, verify the exact position in the application tab to ensure correct placement.

Quality Assurance

Delphi draws on more than 100 years of OE experience and supplier knowledge from work with leading automakers. That OE background is reflected in the ES20035’s application-specific design and replacement-focused construction for emission control service.