Delphi ES10559 Oxygen Sensor - Rear

Delphi ES10559 Oxygen Sensor Overview

Delphi ES10559 is a non-heated oxygen sensor built for emission control applications that require accurate exhaust feedback. It uses a 2-wire design, a square connector, and an 18 x 1.5 mm thread size for direct-fit service on listed vehicles.

Compatible with 1989 Geo Prizm, 1990 Geo Prizm to chassis # LZ090310, and 1989 Toyota Van rear applications, this Delphi oxygen sensor supports proper air-fuel monitoring in the exhaust stream. Delphi draws on OE heritage and supplier experience to build aftermarket parts with application-specific engineering.

Key Features

• Non-heated oxygen sensor design
• 2-wire configuration
• Square connector shape
• 18 x 1.5 mm thread size
• Overall length: 505.0
• Includes oxygen sensor and instruction sheet
• Position-specific fitment for front or rear applications, depending on vehicle

Detailed Fitment and Function

Delphi ES10559 is an emission control sensor used to monitor exhaust oxygen content and relay that information to the engine management system. On the 1989 Geo Prizm, 1990 Geo Prizm to chassis # LZ090310, and 1989 Toyota Van rear application, this sensor supports the feedback loop needed for fuel control and emissions performance. This part cross-references DENSO Auto Parts 234-2062 for the same application.

Common Issues This Sensor May Address

• Check engine light related to oxygen sensor performance
• Incorrect fuel mixture readings from the exhaust stream
• Rough idle caused by inaccurate sensor feedback
• Failed emissions inspection tied to sensor output
• Reduced drivability from aging exhaust sensor response

Installation Notes and Tips

Verify the sensor position before ordering, since listed applications include front, rear, and chassis-specific fitment. Confirm the connector shape, wire count, and thread size against the original part before installation. Use the vehicle application details for the exact placement on your Geo Prizm or Toyota Van, and follow the included instruction sheet during service.

Quality Assurance

Delphi builds this oxygen sensor using OE experience and knowledge developed through long-term supplier relationships with major automakers. That OE heritage is reflected in the part’s application-specific design and service-ready construction.