Delphi ES10277 Oxygen Sensor

Delphi ES10277 Oxygen Sensor Overview

The Delphi ES10277 is a non-heated upstream oxygen sensor built for older import applications that use a universal connector and 18 x 1.5 mm thread size. It is a direct-fit style replacement for select Audi, Volkswagen, Mercedes-Benz, and Porsche models, including Audi 4000 Quattro, Volkswagen Golf, and Porsche 944 applications with the specified 210 mm overall length.

Delphi draws on OE heritage and decades of supplier experience, so this oxygen sensor reflects the same engineering focus used in original equipment development. If you are replacing a worn upstream sensor on a 1985-1987 Audi Coupe or a 1985 Mercedes-Benz 380SL, ES10277 provides the correct fitment details for the listed vehicles.

Key Features

• Part number: Delphi ES10277
• Sensor type: non-heated oxygen sensor
• Upstream position
• Universal connector shape
• 1-wire design
• Thread size: 18 x 1.5 mm
• Overall length: 210.0 mm
• Package includes oxygen sensor and instruction sheet

Detailed Description

The Delphi ES10277 oxygen sensor is specified for upstream exhaust monitoring on select 1985-1987 Audi, Volkswagen, Mercedes-Benz, and Porsche vehicles. It is listed for applications such as 1985-1987 Audi 4000 Quattro, 1985-1987 Volkswagen Jetta, 1985 Mercedes-Benz 500SEL, and 1985 Porsche 944 without California Emission System. The 210 mm overall length is an important fitment detail for these vehicles, and the universal connector helps match the original-style installation requirements where listed.

Delphi’s OE background is built into the design approach, with aftermarket parts informed by long-term original equipment experience. This ES10277 oxygen sensor cross-references select applications from DENSO, Gates, Walker Products, and other listed interchange numbers for the same use cases. For shoppers searching for a 1985-1987 Volkswagen Golf oxygen sensor or an upstream oxygen sensor for Audi Coupe and Volkswagen Quantum, this part number is the cataloged match for the specified fitments.

What This Oxygen Sensor Helps Address

• Check engine light concerns related to upstream oxygen sensor output
• Incorrect air-fuel feedback from a worn non-heated sensor
• Rough idle or drivability issues tied to exhaust mixture monitoring
• Failed emissions testing caused by an aging oxygen sensor
• Restoration needs on older Audi, Volkswagen, Mercedes-Benz, and Porsche vehicles

Installation Notes and Tips

• Verify the vehicle uses the listed 210 mm overall length before ordering.
• Confirm upstream placement and 18 x 1.5 mm thread size match the original sensor.
• Use the instruction sheet included in the package during installation.
• Inspect the exhaust bung threads and wiring routing before final tightening.
• For fitment-specific searches, this Delphi ES10277 oxygen sensor is listed for 1985-1987 Audi 4000 Quattro, 1985-1987 Volkswagen Golf, and 1985 Porsche 944 applications with the stated notes.

Quality Assurance

Delphi supports this part with OE-based engineering knowledge developed through long-term supplier experience with major automakers. The ES10277 is built to the cataloged specifications for the listed upstream applications, including Audi 4000 Quattro, Volkswagen Jetta, and Mercedes-Benz 380SE fitments.