Delphi ES20010 Oxygen Sensor - Rear
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Delphi

Delphi ES20010 Oxygen Sensor - Rear

Brand Delphi ES20010
Position Rear
Connector Shape Flat
Overall Length 310.0
Package Contents Oxygen Sensor, Instruction Sheet
Sensor Type Heated
Thread Size 18 x 1.5 mm
Wire Quantity 4
Fits Buick · 1 vehicle

Heated sensor. Provides faster operation for more responsive emissions monitoring.

Flat connector. Simplifies hookup with a low-profile electrical connection.

OE heritage. Built with decades of original-equipment experience.

Cross-references BBB Industries 13423, DENSO Auto Parts 234-4012 and Gates 21551 for the same application. See all 12.

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Rear Oxygen Sensor for Buick Regal

Delphi ES20010 is a heated rear oxygen sensor built with OE experience from a supplier to major automakers. It is a direct-fit emission control sensor for the 1994 Buick Regal rear position, with a 4-wire flat connector and 18 x 1.5 mm thread size.

Key Features

  • Heated oxygen sensor for rear exhaust placement
  • 4-wire design with flat connector shape
  • 18 x 1.5 mm thread size for proper mounting
  • Overall length: 310.0
  • Includes oxygen sensor and instruction sheet
  • Delphi ES20010 aftermarket replacement built from OE heritage and application knowledge

Detailed Description

Delphi ES20010 is an emission control oxygen sensor for the rear location on the 1994 Buick Regal. As a heated sensor, it reaches operating temperature faster and supports accurate exhaust monitoring once installed in the correct rear position. The flat connector, 4-wire layout, and 18 x 1.5 mm thread size help match the original-style fitment for this Buick Regal application. If you are replacing a worn rear O2 sensor on a 1994 Buick Regal, Delphi ES20010 provides a direct replacement option backed by Delphi’s OE-focused engineering background.

This part cross-references DENSO Auto Parts 234-4012 for the same application.

What It Helps Address

  • Check engine light related to rear oxygen sensor performance
  • Incorrect exhaust feedback from a failing rear sensor
  • Reduced emissions monitoring accuracy
  • Slow sensor response after warm-up
  • Driveability issues tied to aging emission control components

Installation Notes and Tips

Verify the rear sensor location before installation and confirm the connector shape, wire count, and thread size match the original unit. Inspect the exhaust bung threads and wiring routing before tightening the sensor. For best results, compare the removed sensor to Delphi ES20010 before final installation on the 1994 Buick Regal.

Quality Assurance

Delphi draws on more than 100 years of OE experience and knowledge developed through supplying major automakers. That OE heritage is built into this rear oxygen sensor for the Buick Regal application.

Related reading

This part fits 1 vehicle
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
1994BuickRegalRear—
Directly replaces or cross-references 12 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
BBB Industries — 13423DENSO Auto Parts — 234-4012Gates — 21551138-222191781172502461925133737AFS90WOS147REA1384SG238SU1088