Delphi ES10921 Oxygen Sensor

Delphi ES10921 Oxygen Sensor Overview

The Delphi ES10921 oxygen sensor is an OE-style emission control replacement built from Delphi’s century of original equipment experience. It is specified with a 5-wire design, square connector shape, and 18 x 1.5 mm thread size for direct-fit applications across select Audi, BMW, Mercedes-Benz, Porsche, and Volkswagen models.

Use the Delphi ES10921 when you need a front oxygen sensor for vehicles such as the Audi A4, BMW 760i, or Volkswagen Touareg with the correct harness and mounting configuration. This part number, ES10921, is listed for multiple front, left, and right positions depending on the vehicle application.

Key Features

• Delphi ES10921 oxygen sensor for emission control service
• 5-wire sensor design for listed applications
• Square connector shape for OE-style electrical connection
• 18 x 1.5 mm thread size
• Overall length: 950.0 mm
• Package contents: oxygen sensor and instruction sheet
• Fits front, front left, front right, left, and right positions by application

Detailed Description

Delphi builds the ES10921 using OE heritage and application knowledge developed through long-term supplier experience with major automakers. That background is reflected in the sensor’s fitment-specific design, including the 950 mm overall length and the connector and thread specifications needed for listed vehicles. This oxygen sensor is used on select 1999-2006 Audi A4, A4 Quattro, TT, and TT Quattro models, as well as BMW 545i, 645Ci, 745i, 745Li, 760i, 760Li, X5, Mercedes-Benz C230, Porsche Cayenne, and Volkswagen Golf, Jetta, Passat, Phaeton, Touareg, Beetle, R32, and EuroVan applications. This part cross-references Bosch 17014 and DENSO Auto Parts 234-5028 for the same application.

What This Oxygen Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings
• Slow or unstable sensor response
• Emission test failures tied to sensor faults
• Driveability issues caused by inaccurate exhaust feedback

Installation Notes and Tips

• Confirm the exact position on your vehicle before ordering; this part is listed for front, front left, front right, left, and right locations depending on application.
• Verify the harness cover color and harness length where noted in BMW applications.
• Match the 18 x 1.5 mm thread size and 950 mm overall length to the original sensor.
• Use the vehicle application data to confirm compatibility for Audi A4, BMW 760i, and Volkswagen Touareg fitments.
• Follow the included instruction sheet during installation.

Quality Assurance

Delphi’s OE background and supplier experience are built into this aftermarket oxygen sensor, supporting consistent fitment and specification alignment for the listed applications. The ES10921 is engineered as a direct replacement for confirmed vehicle positions rather than a universal sensor.