Delphi ES20033 Oxygen Sensor - Front or Rear

Delphi ES20033 Oxygen Sensor Overview

The Delphi ES20033 is a heated oxygen sensor built for emission control applications that require accurate exhaust feedback and OE-style fitment. It uses a 4-wire design with a square connector and 18 x 1.5 mm thread size, with an overall length of 530.0 mm for the listed Toyota applications.

Backed by Delphi’s OE heritage and more than 100 years of original-equipment experience, this oxygen sensor reflects the engineering knowledge used by major automakers. It is a direct-fit option for select Toyota 4Runner, Pickup, Previa, and Land Cruiser applications, including front and rear positions where specified.

Key Features

• Heated oxygen sensor for emission control system service
• 4-wire configuration with square connector shape
• 18 x 1.5 mm thread size
• 530.0 mm overall length
• Package contents include the oxygen sensor and instruction sheet
• Fits front and rear positions depending on vehicle application
• Delphi ES20033 OE-style replacement for select Toyota models

Detailed Description

The Delphi ES20033 oxygen sensor is engineered for vehicles that rely on precise exhaust oxygen monitoring to support fuel control and emissions performance. Its heated design helps the sensor reach operating temperature quickly, which is important for consistent signal response during cold starts and normal driving. This part number is listed for select 1988-1995 Toyota Land Cruiser, 1991-1995 Toyota Previa, 1992-1995 Toyota Pickup, and 1992-1995 Toyota 4Runner applications, with position and emissions-system notes varying by vehicle.

This part cross-references Bosch 13200 and DENSO Auto Parts 234-4052 for the same application. If you are replacing a worn Toyota 4Runner oxygen sensor, a Toyota Pickup front oxygen sensor, or a Toyota Previa heated oxygen sensor, Delphi ES20033 provides the specified connector, thread, and length details needed for proper replacement.

What It Helps Address

• Check engine light concerns related to oxygen sensor performance
• Incorrect air-fuel feedback from a failing exhaust sensor
• Rough idle or drivability issues tied to aging sensor response
• Emissions test failures caused by degraded sensor output
• Replacement needs for Toyota 4Runner, Pickup, Previa, and Land Cruiser exhaust systems

Installation Notes and Tips

• Verify the vehicle’s emissions configuration before ordering; fitment varies by California Emission System and non-California applications.
• Confirm the required position using the application details: front, rear, or not position-specific where listed.
• Match the 530 mm overall length, 4-wire layout, square connector, and 18 x 1.5 mm thread size to the original sensor.
• Review the included instruction sheet before installation.
• Use the vehicle application tab to confirm the exact Toyota 4Runner, Toyota Pickup, Toyota Previa, or Toyota Land Cruiser match.

Quality Assurance

Delphi builds aftermarket parts using OE experience and supplier knowledge developed through decades of original-equipment work. The ES20033 reflects that background with application-specific engineering for select Toyota emission control systems.