Delphi ES20178 Oxygen Sensor - Front, Rear, Rear Left or Rear Right
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Delphi

Delphi ES20178 Oxygen Sensor - Front, Rear, Rear Left or Rear Right

Brand Delphi ES20178
Position Rear
Connector Shape Flat
Overall Length 900.0
Package Contents Oxygen Sensor, Instruction Sheet
Position(s) Front, 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 Audi, Porsche, and Volkswagen · 62 vehicles

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

Flat connector. Simplifies installation with a compact, easy-to-match design.

OE heritage. Built from 100 years of OE experience and supplier knowledge.

Cross-references BBB Industries 16557, BBB Industries 16978 and BBB Industries 16980 for the same application. See all 66.

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Delphi ES20178 Oxygen Sensor Overview

The Delphi ES20178 is a heated oxygen sensor built for rear and front applications on select Audi, Volkswagen, and Porsche vehicles. It uses a 4-wire design, flat connector shape, and 18 x 1.5 mm thread size with a 900 mm overall length for the listed fitments.

Built from Delphi’s OE heritage and decades of supplier experience, this oxygen sensor is made for accurate exhaust feedback on vehicles such as the Audi A8 Quattro, Volkswagen Touareg, and Porsche Cayenne. The Delphi ES20178 is a direct-fit replacement for the specified positions and model years below.

  • Heated oxygen sensor for faster operating temperature response
  • 4-wire configuration with flat connector shape
  • 18 x 1.5 mm thread size
  • 900 mm overall length for listed rear and front applications
  • Includes oxygen sensor and instruction sheet
  • Fits front, rear, rear left, and rear right positions depending on vehicle application

Fitment and Application Details

Compatible With select 1999-2009 Audi, Volkswagen, and Porsche applications, including rear oxygen sensor service on the Audi TT Quattro, Volkswagen Golf, Volkswagen Jetta, Volkswagen Phaeton, Volkswagen Touareg, and Porsche Cayenne. It also fits front oxygen sensor applications on the Audi Allroad Quattro and Audi A6 Quattro.

  • Fits 2005-2009 Audi A8 Quattro, rear
  • Fits 2004-2006 Audi TT Quattro, rear
  • Fits 2001-2006 Audi TT Quattro, rear
  • Fits 2003-2006 Porsche Cayenne, rear
  • Fits 2004-2006 Volkswagen Phaeton, rear
  • Fits 2004-2006 Volkswagen Touareg, rear right
  • Fits 2004-2006 Volkswagen Touareg, rear left
  • Fits 2002-2005 Audi Allroad Quattro, front
  • Fits 2000-2005 Volkswagen Golf, rear
  • Fits 2002-2004 Audi A6 Quattro, front
  • Fits 2000-2004 Volkswagen Jetta, rear
  • Fits 2002-2004 Volkswagen Passat, rear right
  • Fits 2002-2004 Volkswagen Passat, rear left
  • Fits 2004 Volkswagen R32, rear left
  • Fits 2001 Audi TT, rear
  • Fits 2001 Audi TT Quattro, rear
  • Fits 1999-2001 Volkswagen Beetle, rear
  • Fits 2000 Audi TT, rear

What This Oxygen Sensor Helps Address

  • Check engine light related to oxygen sensor performance
  • Incorrect air-fuel feedback from a worn rear or front sensor
  • Slow sensor response after exhaust system aging
  • Fault codes tied to heater circuit or sensor signal issues
  • Emissions inspection failures caused by a failing sensor

Installation Notes and Tips

Confirm the exact position on your vehicle before ordering, since this part is listed for front, rear, rear left, and rear right locations depending on application. Verify connector style, thread size, and 900 mm lead length against the original sensor before installation. This part cross-references Bosch (e.g., 16034, 16132) for the same application.

Quality Assurance

Delphi draws on OE supplier experience and original-equipment engineering knowledge to produce aftermarket parts that follow the requirements of the listed applications. Part number ES20178 is built for the specified fitments and packaged with an instruction sheet for reference during installation.

Related reading

This part fits 62 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelPositionNotes
2009AudiA8 Quattro—RearCylinders 1 through 12; with 900mm Overall Length
2008AudiA8 Quattro—RearCylinders 1 through 12; with 900mm Overall Length
2007AudiA8 Quattro—RearCylinders 1 through 12; with 900mm Overall Length
2006AudiA8 Quattro—RearCylinders 1 through 12; with 900mm Overall Length
2006AudiTT Quattro—RearBrown; with 900mm Overall Length
2006AudiTT Quattro—RearOxygen sensor with 900mm overall length
2006PorscheCayenne—RearOxygen sensor with 900mm overall length
2006VolkswagenPhaeton—RearCylinders 1 through 12; with 900mm Overall Length
2006VolkswagenTouareg—Rear RightOxygen sensor with 900mm overall length
2006VolkswagenTouareg—Rear LeftOxygen sensor with 900mm overall length
2005AudiA8 Quattro—RearCylinders 1 through 12; with 900mm Overall Length
2005AudiAllroad Quattro—FrontOxygen sensor with 900mm overall length
2005AudiTT Quattro—RearBrown; with 900mm Overall Length
2005AudiTT Quattro—RearOxygen sensor with 900mm overall length
2005PorscheCayenne—RearOxygen sensor with 900mm overall length
2005VolkswagenGolf—RearOxygen sensor with 900mm overall length
2005VolkswagenPhaeton—RearCylinders 1 through 12; with 900mm Overall Length
2005VolkswagenTouareg—Rear RightOxygen sensor with 900mm overall length
2005VolkswagenTouareg—Rear LeftOxygen sensor with 900mm overall length
2004AudiA6 Quattro—FrontOxygen sensor with 900mm overall length
2004AudiAllroad Quattro—FrontOxygen sensor with 900mm overall length
2004AudiTT Quattro—RearBrown; with 900mm Overall Length
2004AudiTT Quattro—RearOxygen sensor with 900mm overall length
2004PorscheCayenne—RearOxygen sensor with 900mm overall length
2004VolkswagenGolf—RearOxygen sensor with 900mm overall length
2004VolkswagenJetta—RearOxygen sensor with 900mm overall length
2004VolkswagenPassat—Rear RightOxygen sensor with 900mm overall length
2004VolkswagenPassat—Rear LeftOxygen sensor with 900mm overall length
2004VolkswagenPhaeton—RearCylinders 1 through 12; with 900mm Overall Length
2004VolkswagenR32—Rear LeftOxygen sensor with 900mm overall length
2004VolkswagenTouareg—Rear RightOxygen sensor with 900mm overall length
2004VolkswagenTouareg—Rear LeftOxygen sensor with 900mm overall length
2003AudiA6 Quattro—FrontOxygen sensor with 900mm overall length
2003AudiAllroad Quattro—FrontOxygen sensor with 900mm overall length
2003AudiTT Quattro—RearOxygen sensor with 900mm overall length
2003PorscheCayenne—RearOxygen sensor with 900mm overall length
2003VolkswagenGolf—RearOxygen sensor with 900mm overall length
2003VolkswagenJetta—RearOxygen sensor with 900mm overall length
2003VolkswagenPassat—Rear RightOxygen sensor with 900mm overall length
2003VolkswagenPassat—Rear LeftOxygen sensor with 900mm overall length
2002AudiA6 Quattro—FrontOxygen sensor with 900mm overall length
2002AudiAllroad Quattro—FrontOxygen sensor with 900mm overall length
2002AudiTT Quattro—RearOxygen sensor with 900mm overall length
2002VolkswagenGolf—RearOxygen sensor with 900mm overall length
2002VolkswagenJetta—RearOxygen sensor with 900mm overall length
2002VolkswagenPassat—Rear RightOxygen sensor with 900mm overall length
2002VolkswagenPassat—Rear LeftOxygen sensor with 900mm overall length
2001AudiTT—RearOxygen sensor with 900mm overall length
2001AudiTT Quattro—RearOxygen sensor with 900mm overall length
2001AudiTT Quattro—RearFrom Chassis # 8N-1-034 001; with 900mm Overall Length
2001VolkswagenBeetleGLXRearOxygen sensor with 900mm overall length
2001VolkswagenBeetleGLSRearOxygen sensor with 900mm overall length
2001VolkswagenBeetleGLRearOxygen sensor with 900mm overall length
2001VolkswagenGolf—RearOxygen sensor with 900mm overall length
2001VolkswagenJetta—RearOxygen sensor with 900mm overall length
2000AudiTT—RearFrom Chassis # 8N-Y-001 701 To # 8N-Y-001 700; with 900mm Overall Length
2000VolkswagenBeetle—RearOxygen sensor with 900mm overall length
2000VolkswagenGolfGLSRearOxygen sensor with 900mm overall length
2000VolkswagenGolfGLRearOxygen sensor with 900mm overall length
2000VolkswagenGolf—RearOxygen sensor with 900mm overall length
2000VolkswagenJetta—RearOxygen sensor with 900mm overall length
1999VolkswagenBeetleGLXRearOxygen sensor with 900mm overall length
Directly replaces or cross-references 66 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
BBB Industries — 16557BBB Industries — 16978BBB Industries — 16980Bosch — 16034Bosch — 16132Bosch — 16498Bosch — 16982Carlson — 16213DENSO Auto Parts — 234-4753DENSO Auto Parts — 234-4809DENSO Auto Parts — 234-4850DENSO Auto Parts — 234-4859DENSO Auto Parts — 234-4874Dixie Electric Ltd — 16412Four Seasons — 16422NTK — 25604NTK — 25605NTK — 25622Quality-Built — 16416Walker Products — 250-24432Walker Products — 250-244941K0 998 262 A1K0 998 262 B1K0 998 262 Q06A 906 262 BB06A 906 265 M06A 906 265 Q07C 906 262 H07D 906 262 A07D 906 262 E022 906 262 BG022 906 262 S022 906 265 B022 906 265 C030 906 262 L077 906 262 G077 906 265 AE955 606 136 01163341645216554OS1938OS2368OS2374OS2375OS2377REA1710REA1843REA1849REA1850REA1857SG1184SG1535SG1541SG1542SG1543SG1554SG1558SU6343SU6459SU6460SU6540SU6555SU6608SU6938SU6949