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Delphi ES20034 Oxygen Sensor
| Brand | Delphi ES20034 |
|---|---|
| Connector Shape | Square |
| Overall Length | 605.0 |
| Package Contents | Oxygen Sensor, Instruction Sheet |
| Position(s) | Front |
| Sensor Type | Heated |
| Thread Size | 18 x 1.5 mm |
| Wire Quantity | 4 |
| Fits | Toyota · 2 vehicles |
Heated sensor. Helps the oxygen sensor reach operating temperature quickly.
Square connector. Simplifies matching the existing electrical connection.
OE heritage. Built with decades of original-equipment experience.
Cross-references DENSO Auto Parts 234-4053, Gates 21323 and Gates 24118 for the same application. See all 18.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Delphi ES20034 Oxygen Sensor Overview
The Delphi ES20034 is a heated oxygen sensor built for emission control service on select Toyota applications. It uses a 4-wire design, square connector shape, and 18 x 1.5 mm thread size for a direct-fit style replacement where specified.
Compatible with 1988 Toyota 4Runner with rear wheel drive and 1988 Toyota Pickup, this front oxygen sensor supports accurate exhaust feedback for the engine management system. Delphi draws on OE heritage and decades of supplier experience to build aftermarket parts with factory-style engineering knowledge.
Key Features
- Heated oxygen sensor for faster operating temperature response
- 4-wire configuration for signal and heater circuit operation
- Square connector shape for application-specific fitment
- 18 x 1.5 mm thread size
- Overall length: 605.0
- Front position application
- Package includes oxygen sensor and instruction sheet
Detailed Description
Delphi ES20034 is an emission control oxygen sensor intended for front sensor locations on select 1988 Toyota 4Runner and Toyota Pickup models. If you are replacing a worn front O2 sensor on a 1988 Toyota 4Runner with rear wheel drive or a 1988 Toyota Pickup, this part number provides the specified heated, 4-wire configuration with the correct connector style and thread size. This part cross-references DENSO Auto Parts 234-4053 for the same application.
Common Reasons for Replacement
- Check engine light related to oxygen sensor performance
- Rough idle or inconsistent air-fuel feedback
- Reduced fuel control accuracy from a failing front sensor
- Emission test failure tied to sensor response issues
- Corrosion, wiring wear, or connector damage at the sensor
Installation Notes and Tips
Verify the connector shape, thread size, and front position before installation. Confirm vehicle application details for the 1988 Toyota 4Runner and 1988 Toyota Pickup, including rear wheel drive on the 4Runner listing. Inspect the exhaust bung threads and wiring routing before tightening the Delphi ES20034 into place.
Quality Assurance
Delphi builds this oxygen sensor using OE experience and supplier knowledge developed through work with major automakers. The ES20034 reflects that OE-focused background in an aftermarket replacement part for emission control service.
| Year | Make | Model | Drive Type | Position | Notes |
|---|---|---|---|---|---|
| 1988 | Toyota | 4Runner | — | N/A | with Rear Wheel Drive |
| 1988 | Toyota | Pickup | RWD | N/A | — |
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