Delphi ES10591 Oxygen Sensor - Front

Delphi ES10591 Oxygen Sensor for Front Applications

The Delphi ES10591 is a heated oxygen sensor built for front-position exhaust monitoring on select Chrysler and Dodge vehicles. It combines OE-based engineering with a 4-wire design, round connector, and 18 x 1.5 mm thread size for direct replacement service.

Compatible with 2001-2002 Chrysler PT Cruiser front, 2002-2004 Chrysler 300M front, 2002-2004 Chrysler Concorde front, and 2002-2004 Dodge Intrepid front, this Delphi oxygen sensor supports accurate air-fuel feedback for drivability and emissions control.

Key Features

• Brand: Delphi
• Part number: ES10591
• Heated oxygen sensor for front placement
• 4-wire configuration
• Round connector shape
• 18 x 1.5 mm thread size
• Overall length: 400.0
• Includes oxygen sensor and instruction sheet
• OE heritage and aftermarket engineering informed by Delphi’s supplier experience

Detailed Description

Delphi ES10591 is an emission control oxygen sensor engineered for front exhaust locations where the engine management system monitors exhaust oxygen content. Its heated design helps the sensor reach operating temperature more quickly, supporting stable signal output during normal driving conditions. The 4-wire layout, round connector, and metric thread specification make it a practical replacement for the listed Chrysler and Dodge applications. This part cross-references DENSO Auto Parts (e.g., 234-4005, 234-4115) for the same application.

Use ES10591 when servicing a front oxygen sensor on a 2001-2002 Chrysler PT Cruiser, 2002-2004 Chrysler 300M, 2002-2004 Chrysler Concorde, or 2002-2004 Dodge Intrepid. The Delphi ES10591 is built from OE-focused knowledge developed through long-term supplier experience with major automakers.

What It Helps Address

• Check engine light related to front oxygen sensor performance
• Rough idle caused by inaccurate exhaust feedback
• Reduced fuel economy from incorrect air-fuel mixture control
• Emissions test failures tied to sensor response issues
• Driveability concerns from a worn or slow-reacting sensor

Installation Notes and Tips

Verify connector shape, wire count, thread size, and front position before installation. Compare the removed sensor to the Delphi ES10591 to confirm length and connector match. Follow the included instruction sheet and inspect the harness routing and exhaust threads during replacement. For fitment reference, this part fits 2002-2004 Chrysler 300M, front; 2002-2004 Chrysler Concorde, front; 2002-2004 Dodge Intrepid, front; and 2001-2002 Chrysler PT Cruiser, front.

Quality Assurance

Delphi draws on OE heritage and supplier experience built over more than a century of automotive development. That background is reflected in the ES10591 oxygen sensor’s application-specific design and replacement-focused construction.