Delphi ES20174 Oxygen Sensor

Delphi ES20174 Oxygen Sensor for Mercedes-Benz

Delphi ES20174 is a heated oxygen sensor built for precise exhaust monitoring in select Mercedes-Benz applications. With OE heritage from a supplier to major automakers, this sensor is engineered to match the demands of front and rear sensor locations across a wide range of Mercedes-Benz models.

Key Features

• Heated oxygen sensor for faster operating temperature and stable signal output
• 4-wire design with round connector shape
• Thread size: 18 x 1.5 mm
• Overall length: 900.0
• Includes oxygen sensor and instruction sheet
• Fits front, front left, front right, rear, and rear left positions depending on vehicle application

Detailed Description

The Delphi ES20174 oxygen sensor is a direct-fit emission control component for Mercedes-Benz vehicles that require a heated, 4-wire sensor with an 18 x 1.5 mm thread. It is used in applications such as the Mercedes-Benz E320, C320, CLK500, G500, and ML500, as well as other listed models, where accurate exhaust feedback is needed for engine management and emissions control. Delphi part number ES20174 is backed by the company’s OE experience and manufacturing knowledge developed through decades of supplying automakers.

This part cross-references Bosch 16318 and DENSO Auto Parts 234-4893 for the same application.

What It Is Used For

• Restoring oxygen sensor signal accuracy after sensor aging or contamination
• Addressing check engine light concerns related to oxygen sensor performance
• Supporting proper air-fuel ratio control in Mercedes-Benz E320, C320, CLK500, and related models
• Correcting drivability issues tied to slow sensor response or inconsistent exhaust readings
• Maintaining emissions system monitoring at front or rear sensor locations

Installation Notes and Tips

Confirm the exact position on your vehicle before ordering, since ES20174 is listed for front, front left, front right, rear, and rear left applications. Verify connector shape, wire count, and thread size against the original sensor, and follow the included instruction sheet during installation. For best results, inspect the harness and exhaust bung threads before fitting the new sensor.

Quality Assurance

Delphi builds this oxygen sensor using OE-based engineering knowledge developed over 100 years of experience supplying top automakers. That background supports consistent fitment and sensor performance across the listed Mercedes-Benz applications.