Delphi ES10143 Oxygen Sensor - Left or Right

Delphi ES10143 Oxygen Sensor Overview

The Delphi ES10143 oxygen sensor is a heated, upstream emission control sensor built for select Ford, Mazda applications with California Emission System calibration. It uses a 3-wire design, square connector, and 18 x 1.5 mm thread size for direct-fit replacement where specified by the vehicle application.

Built from Delphi’s OE heritage and decades of supplier experience, this oxygen sensor is engineered with the same application knowledge used in original equipment development. It is a practical replacement for drivers servicing a 1994-1995 Ford Probe, 1994-1995 Mazda 626, or 1994-1995 Mazda MX-6.

Key Features

• Heated oxygen sensor for faster operating temperature and signal response
• 3-wire construction
• Square connector shape
• 18 x 1.5 mm thread size
• Overall length: 350.0
• Position(s): Left, Right, Upstream; verify the exact location for your vehicle
• Package contents: Oxygen Sensor, Instruction Sheet

Detailed Description

Delphi ES10143 is an emission control oxygen sensor intended for upstream placement on specific California Emission System vehicles. It is listed for the left or right side on 1994-1995 Mazda 626 and Mazda MX-6, and for 1994-1995 Ford Probe applications where the vehicle listing calls for this sensor configuration. The heated design helps the sensor reach operating temperature quickly so the engine control system can monitor exhaust oxygen content sooner after startup.

This part cross-references DENSO Auto Parts 234-3042 for the same application. Delphi ES10143 is a direct replacement choice when servicing a 1994-1995 Mazda 626 oxygen sensor, 1994-1995 Mazda MX-6 upstream sensor, or 1994-1995 Ford Probe California Emission System sensor.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings
• Slow sensor response during cold starts
• Emissions test failures tied to sensor output
• Rough idle or drivability issues caused by inaccurate exhaust feedback

Installation Notes and Tips

Confirm the exact position on your vehicle before ordering, since this part is listed for left, right, and upstream locations depending on application. Match the connector shape, thread size, and wire count to the original sensor before installation. For best results, inspect the harness routing and exhaust bung condition during replacement, and follow the vehicle-specific service procedure for torque and connector handling.

Quality Assurance

Delphi draws on more than 100 years of OE experience and supplier knowledge used by major automakers, and that original-equipment background informs the design of this aftermarket oxygen sensor. The ES10143 is built to reflect the fitment and specification requirements of the listed Ford and Mazda applications.