Delphi ES20145 Oxygen Sensor - Front, Front Left, Rear or Rear Left

Delphi ES20145 Oxygen Sensor

The Delphi ES20145 is a heated oxygen sensor built for precise exhaust monitoring and OE-style replacement performance. With Delphi’s OE heritage and supplier experience behind it, this sensor is a direct-fit option for select Mazda, Ford, and Suzuki applications that require the correct thread, connector, and wire configuration.

• Heated oxygen sensor for faster operating temperature and stable signal output
• 4-wire design with square connector shape
• 18 x 1.5 mm thread size for proper exhaust bung fitment
• Overall length: 340.0
• Includes oxygen sensor and instruction sheet
• Position-specific coverage for front, front left, rear, and rear left applications

OE-Style Fit and Application Coverage

Delphi ES20145 is engineered using OE experience and manufacturing knowledge developed through work with major automakers. It is a direct replacement oxygen sensor for select 1995-2005 vehicles, including Fits 2001-2003 Mazda Protege, front; Fits 2002-2003 Mazda Protege5, front; Fits 1996-2000 Mazda 626, front; Fits 1997-2000 Mazda Millenia, front left; Fits 2001-2002 Mazda Millenia, rear left; Fits 1995-1996 Mazda Millenia, rear left; Fits 1997 Mazda MX-6, front; Fits 1996-1997 Ford Probe, rear; and Fits 2004-2005 Suzuki Forenza, rear. This part number, ES20145, is also cross-referenced with DENSO Auto Parts 234-4041 for the same application.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn sensor
• Reduced fuel economy caused by slow or inaccurate exhaust feedback
• Rough idle or hesitation tied to faulty sensor input
• Emission test failure caused by degraded sensor response

Installation Notes and Tips

Verify the vehicle’s exact position before ordering, since ES20145 is used in front, front left, rear, and rear left locations depending on application. Confirm the 18 x 1.5 mm thread size, 4-wire configuration, and square connector shape match the original sensor. For 1996-2000 Mazda 626 applications, this sensor is listed for vehicles without California Emission System. Use the included instruction sheet during installation and inspect the connector routing and exhaust harness condition before final assembly.

Quality Assurance

Delphi builds this oxygen sensor with OE-based engineering knowledge drawn from more than a century of original-equipment experience. That background supports consistent fitment, connector integrity, and sensor design for service replacement on select Mazda, Ford, and Suzuki models.