Delphi ES20320 Oxygen Sensor - Front Left, Rear, Rear Left or Rear Right
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Delphi

Delphi ES20320 Oxygen Sensor - Front Left, Rear, Rear Left or Rear Right

Brand Delphi ES20320
Position Rear
Connector Shape Square
Overall Length 310.0
Package Contents Oxygen Sensor, Instruction Sheet
Position(s) Front Left, Rear, Rear Left, Rear Right. For the position specific to your vehicle, refer to the Application tab.
Sensor Type Heated
Thread Size 18 x 1.5 mm
Wire Quantity 4
Fits Chevrolet, Pontiac, Saturn, Buick, Hummer, Oldsmobile, and GMC · 114 vehicles

Heated sensor. Delivers faster operation for more consistent emissions monitoring.

Square connector. Provides a straightforward electrical connection for installation.

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

Cross-references BBB Industries 13780, Bosch 15159 and Bosch 15698 for the same application. See all 70.

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Delphi ES20320 Oxygen Sensor Overview

The Delphi ES20320 is a heated oxygen sensor built for precise exhaust monitoring in a wide range of GM applications. It uses a 4-wire design with a square connector and 18 x 1.5 mm thread size for direct-fit replacement where specified.

Backed by Delphi’s OE heritage and more than 100 years of original-equipment experience, this oxygen sensor reflects the engineering knowledge used by major automakers. It is a practical choice for rear and front-left positions on vehicles such as the Chevrolet Corvette, Chevrolet Impala, and Pontiac G6.

Key Features

  • Heated oxygen sensor for faster operating temperature and stable signal output
  • 4-wire configuration with square connector
  • 18 x 1.5 mm thread size
  • Overall length: 310.0
  • Package contents: oxygen sensor and instruction sheet
  • Position coverage includes front left, rear, rear left, and rear right applications

Detailed Description

Delphi ES20320 is engineered as an OE-style replacement oxygen sensor for emissions monitoring and fuel control feedback. It is used in rear sensor locations on many GM platforms, including Fits 2005-2013 Chevrolet Corvette, rear; Fits 2004-2011 Chevrolet Impala, rear; and Fits 2008-2010 Chevrolet Malibu, rear right. It also covers front-left applications such as Fits 2000-2002 Chevrolet Astro, front left and Fits 2000-2002 GMC Safari, front left.

This part cross-references DENSO Auto Parts (e.g., 234-4254, 234-4255) for the same application. The Delphi ES20320 part number is also commonly searched for rear oxygen sensor replacement on Chevrolet Malibu, Pontiac G6, and Saturn Vue models.

What It Helps Address

  • Check engine light related to oxygen sensor performance
  • Incorrect air-fuel ratio feedback from a worn sensor
  • Slow sensor response after exhaust heat-up
  • Emissions test failures tied to sensor signal issues
  • Rough idle or drivability concerns linked to faulty exhaust feedback

Installation Notes and Tips

Confirm the exact sensor position before ordering, since this part is listed for front left, rear, rear left, and rear right locations depending on vehicle application. Match the connector shape, wire count, and thread size to the original sensor, and verify clearance along the 310.0 overall length before installation. For fitment-specific use, check the application details for your Chevrolet Corvette, Chevrolet Impala, or Pontiac G6.

Quality Assurance

Delphi builds this oxygen sensor using OE heritage and supplier experience developed with top automakers, bringing original-equipment knowledge into the aftermarket replacement part. The ES20320 is supplied with an instruction sheet for installation reference.

Related reading

This part fits 114 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelFuel TypePositionNotes
2013ChevroletCorvette——Rear—
2012ChevroletCorvette——Rear—
2012ChevroletMalibu——Rear Left—
2011ChevroletCorvette——Rear—
2011ChevroletImpalaLTZ—Rear—
2011ChevroletImpalaLS—Rear—
2011ChevroletImpala——Rear—
2011ChevroletMalibu——Rear Left—
2010ChevroletCorvette——Rear—
2010ChevroletImpalaLTZ—Rear—
2010ChevroletImpalaLS—Rear—
2010ChevroletImpala——Rear—
2010ChevroletMalibu——Rear Left—
2010ChevroletMalibu——Rear Right—
2010PontiacG6——Rear Right—
2010SaturnVue——Rear—
2009ChevroletCorvette——Rear—
2009ChevroletEquinox——Rear—
2009ChevroletImpala——Rear—
2009ChevroletMalibu——Rear Left—
2009ChevroletMalibu——Rear Right—
2009PontiacG6——Rear Right—
2009PontiacG6——Rear Left—
2009PontiacG6GTGASRear Right12in Length
2009PontiacTorrent——Rear—
2009SaturnAura——Rear Left—
2009SaturnVue——Rear—
2008BuickLucerne——Rear—
2008ChevroletCorvette——Rear—
2008ChevroletEquinox——Rear—
2008ChevroletImpala——Rear—
2008ChevroletMalibu——Rear Left—
2008ChevroletMalibuClassic LT—Rear Right—
2008ChevroletMalibuClassic LS—Rear Right—
2008ChevroletUplander——Rear—
2008PontiacG6——Rear Right—
2008PontiacG6——Rear Left—
2008PontiacG6GTGASRear Right12in Length
2008PontiacTorrent——Rear—
2008SaturnAura——Rear Left—
2008SaturnAura——Rear Right—
2008SaturnVue——Rear—
2007BuickLaCrosse——Rear—
2007BuickLucerne——Rear—
2007BuickRendezvous——Rear—
2007BuickTerraza——Rear—
2007ChevroletCorvette——Rear—
2007ChevroletEquinox——Rear—
2007ChevroletImpala——Rear—
2007ChevroletImpalaLTZ—Rear—
2007ChevroletImpalaLT—Rear—
2007ChevroletMonte Carlo——Rear—
2007ChevroletUplander——Rear—
2007PontiacG6——Rear Left—
2007PontiacGrand Prix——Rear—
2007PontiacTorrent——Rear—
2007SaturnAura——Rear Left—
2007SaturnRelay——Rear—
2006BuickLaCrosse——Rear—
2006BuickLucerne——Rear—
2006BuickRendezvous——Rear—
2006BuickTerraza——Rear—
2006ChevroletCorvette——Rear—
2006ChevroletEquinox——Rear—
2006ChevroletImpala——Rear—
2006ChevroletImpalaLTZ—Rear—
2006ChevroletImpalaLT—Rear—
2006ChevroletMonte Carlo——Rear—
2006ChevroletUplander——Rear—
2006HummerH3——Rear—
2006PontiacG6GTGASRear Left12in Length
2006PontiacG6——Rear Left—
2006PontiacGrand Prix——Rear—
2006PontiacMontana——Rear—
2006PontiacMontanaSV6GASRear12in Length
2006PontiacTorrent——Rear—
2006SaturnRelay——Rear—
2005BuickCentury——Rear—
2005BuickLaCrosse——Rear—
2005BuickLeSabre——Rear—
2005BuickPark Avenue——Rear—
2005BuickRendezvous——Rear—
2005BuickTerraza——Rear—
2005ChevroletCorvette——Rear—
2005ChevroletEquinox——Rear—
2005ChevroletImpala——Rear—
2005ChevroletMonte Carlo——Rear—
2005ChevroletUplander——Rear—
2005PontiacAztek——Rear—
2005PontiacBonneville——Rear—
2005PontiacGrand Prix——Rear—
2005PontiacMontanaSV6GASRear12in Length
2005PontiacMontana——Rear—
2005SaturnRelay——Rear—
2004BuickLeSabre——Rear—
2004BuickPark Avenue——Rear—
2004BuickRegal——Rear—
2004ChevroletImpalaSS—Rear—
2004ChevroletImpalaLS—Rear—
2004ChevroletMonte Carlo——Rear—
2004PontiacBonneville——Rear—
2004PontiacGrand Prix——Rear—
2003OldsmobileAurora——Rear—
2002ChevroletAstro——Front Left—
2002GMCSafari——Front Left—
2002OldsmobileAurora——Rear—
2002OldsmobileIntrigue——Rear—
2001ChevroletAstro——Front Left—
2001GMCSafari——Front Left—
2001OldsmobileAurora——Rear—
2001OldsmobileIntrigue——Rear—
2000ChevroletAstro——Front Left—
2000GMCSafari——Front Left—
2000OldsmobileIntrigue——Rear—
Directly replaces or cross-references 70 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
BBB Industries — 13780Bosch — 15159Bosch — 15698Bosch — 15895Bosch — 18079Carlson — 15551DENSO Auto Parts — 234-4254DENSO Auto Parts — 234-4255DENSO Auto Parts — 234-4256DENSO Auto Parts — 234-4347DENSO Auto Parts — 234-4647Gates — 21063Gates — 21514NTK — 21066OSC — 13178Quality-Built — 15553Walker Exhaust — 215685S31795S38555S38565S67145S81245S812611-637138-739215732138002138162138182131552213164121316922133542213422621342302134255213454812559848125617771256262112570149125727721257492412596740126086621260869312608712126111651920980725024267FE80356FE80359FE80360FE80480FE80483OS2008OS2011OS2012OS2132OS2135REA1120SG532SG535SG536SG1299SG1302SU1351SU1369SU1395SU8214