Delphi ES10258 Oxygen Sensor

Delphi ES10258 Oxygen Sensor for Mercedes-Benz 190E

The Delphi ES10258 is a heated upstream oxygen sensor built for precise exhaust monitoring on select Mercedes-Benz 190E applications. It draws on Delphi’s OE heritage and decades of supplier experience to support accurate air-fuel feedback in the engine management system.

Key Features

• Heated oxygen sensor for faster operating temperature and signal response
• Upstream position for pre-catalyst exhaust measurement
• 3-wire design with square and round connector shapes
• 18 x 1.5 mm thread size for direct-fit installation on listed applications
• Overall length: 325.0 mm
• Package contents: oxygen sensor and instruction sheet

Detailed Description

Delphi ES10258 is an upstream oxygen sensor for 1985-1993 Mercedes-Benz 190E models. As a heated sensor, it helps the engine control system reach closed-loop operation more quickly, which is important for maintaining proper fuel delivery and emissions performance. The ES10258 part number is also referenced in cross-application listings such as Bosch 13144 for the same application.

Built with Delphi’s OE-focused engineering background, this oxygen sensor is specified with a 3-wire layout, square and round connector shapes, and an 18 x 1.5 mm thread. For Mercedes-Benz 190E owners searching for a direct replacement oxygen sensor, Delphi ES10258 provides the fitment and connector details needed for a straightforward match.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rough idle caused by incorrect air-fuel feedback
• Reduced fuel economy from inaccurate exhaust readings
• Failed emissions testing tied to upstream sensor faults
• Delayed closed-loop operation after cold starts

Installation Notes and Tips

Verify the connector shape, wire count, thread size, and upstream location before installation. Inspect the harness and exhaust bung condition, and compare the removed sensor to the Delphi ES10258 to confirm the correct Mercedes-Benz 190E application. Follow the included instruction sheet and use proper anti-seize practices only if specified by the vehicle service procedure.

Quality Assurance

Delphi builds aftermarket parts using OE experience and supplier knowledge developed over many years with major automakers. The ES10258 reflects that OE-based approach in its sensor design and application-specific fitment.