Delphi ES20124 Oxygen Sensor - Front

Delphi ES20124 Oxygen Sensor Overview

The Delphi ES20124 is a heated oxygen sensor built for front-position applications on select Suzuki and Chevrolet vehicles. It uses a 4-wire design with a square connector and 18 x 1.5 mm thread size for direct-fit replacement in confirmed applications.

Backed by Delphi’s OE heritage and decades of supplier experience with major automakers, this oxygen sensor reflects the same engineering focus used in original equipment development. It is a practical choice for restoring accurate exhaust feedback on vehicles such as the Suzuki Grand Vitara, Chevrolet Tracker, Suzuki Vitara, and Suzuki Esteem.

Key Features

• Heated oxygen sensor for faster operating temperature and signal response
• 4-wire configuration for the listed front sensor applications
• Square connector shape for OE-style electrical connection
• 18 x 1.5 mm thread size for proper exhaust bung fitment
• Overall length: 350.0 mm
• Package includes oxygen sensor and instruction sheet
• Front position fitment for select Suzuki and Chevrolet models

Detailed Description

Delphi ES20124 is an emission control oxygen sensor engineered for front sensor locations on 1999-2005 Suzuki Grand Vitara, 2001-2004 Chevrolet Tracker, 2004 Suzuki Vitara, and 1999-2002 Suzuki Esteem. The heated design helps the sensor reach operating temperature quickly, supporting stable exhaust monitoring in the applications listed. Delphi’s OE background and supplier experience are built into this aftermarket replacement part, making it a straightforward option when servicing front oxygen sensor faults.

This part cross-references Bosch (e.g., 15040, 15295) for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback from the front exhaust sensor
• Rough idle or drivability issues tied to faulty exhaust readings
• Reduced fuel economy caused by inaccurate sensor input
• Emission test failures linked to a worn front O2 sensor

Installation Notes and Tips

• Verify front sensor placement before installation.
• Confirm the 4-wire connector and square plug match the vehicle harness.
• Check thread size and exhaust bung condition before threading the sensor in.
• Inspect wiring routing and exhaust clearance to avoid heat damage.
• Clear diagnostic trouble codes after installation and confirm proper sensor operation.

Quality Assurance

Delphi builds this oxygen sensor with OE-focused engineering and aftermarket application coverage based on its long history supplying original equipment to major automakers.

Compatible With: Fits 1999-2005 Suzuki Grand Vitara, front; Fits 2001-2004 Chevrolet Tracker, front; Fits 2004 Suzuki Vitara, front; Fits 1999-2002 Suzuki Esteem, front.