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Delphi ES20378 Oxygen Sensor
| Brand | Delphi ES20378 |
|---|---|
| Position | Center Right, Rear Right, Rear, and Rear Left |
| Sensor Type | Heated |
| Wire Quantity | 4 |
| Connector Shape | Flat |
| Thread Size | 18 x 1.5 mm |
| Overall Length | 555.0 |
| Package Contents | Oxygen sensor, instruction sheet |
| Position(s) | Center right, rear, rear left, rear right. for the position speci |
| Fits | Audi, Porsche, and Volkswagen · 60 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 with decades of original-equipment experience.
Cross-references BBB Industries 16383, Bosch 16136 and DENSO Auto Parts 234-4485 for the same application. See all 30.
Delphi ES20378 Oxygen Sensor Overview
Delphi ES20378 is a heated oxygen sensor built for rear and center-right emission control applications on select Audi, Volkswagen, and Porsche vehicles. It uses OE-based engineering from Delphi’s long history as an original equipment supplier, with the fit and signal characteristics needed for accurate exhaust monitoring.
Compatible With Audi A6 Quattro, Audi A8 Quattro, Audi Q7, Audi RS4, Audi RS5, Audi S5, Audi S6, Audi S8, Porsche Cayenne, Volkswagen CC, Volkswagen Eos, Volkswagen Jetta, Volkswagen Passat, Volkswagen R32, and Volkswagen Touareg applications listed below.
- Heated oxygen sensor for faster operating temperature and stable exhaust feedback
- 4-wire design with flat connector shape
- 18 x 1.5 mm thread size for direct-thread mounting
- 555.0 overall length for listed rear and center-right positions
- Includes oxygen sensor and instruction sheet
- Delphi part number ES20378 for OE-style replacement matching
Detailed Fitment and Function
This Delphi ES20378 oxygen sensor monitors exhaust oxygen content so the engine control system can adjust fuel delivery and maintain emissions performance. It is specified for rear, rear left, rear right, and center right positions depending on the vehicle application, including 2006-2016 Volkswagen Jetta and CC rear applications, 2007-2011 Audi A6 Quattro rear applications, and 2007-2010 Volkswagen Touareg rear right applications. The 555 mm overall length is an important match point for these vehicles, and the Delphi ES20378 is also cross-referenced to Bosch 16136 for the same application.
Delphi’s OE heritage and supplier experience are built into this aftermarket oxygen sensor, helping support consistent signal response and proper integration with factory exhaust and engine management systems. For buyers searching for a rear oxygen sensor for Audi RS5, Volkswagen Passat, or Porsche Cayenne, this part number provides a direct-reference option for the listed configurations.
What This Sensor Helps Address
- Check engine light related to oxygen sensor performance
- Incorrect air-fuel ratio feedback from the rear exhaust stream
- Slow sensor response after warm-up
- Emissions test failures tied to sensor output
- Fault codes associated with rear or center-right sensor locations
Installation Notes and Tips
Verify the vehicle’s exact sensor position before ordering, since this part is listed for center right, rear, rear left, and rear right locations depending on application. Confirm the 555 mm overall length, 4-wire configuration, flat connector shape, and 18 x 1.5 mm thread size against the original sensor. Use the application tab or vehicle service information to match the correct bank and position on Audi, Volkswagen, or Porsche models.
Quality Assurance
Delphi builds this oxygen sensor using OE-based engineering and manufacturing knowledge developed through decades of supplying major automakers. That background supports consistent fitment and dependable replacement performance for the listed applications.
| Year | Make | Model | Submodel | Position | Notes |
|---|---|---|---|---|---|
| 2016 | Volkswagen | CC | — | Rear Right | with 555mm Overall Length |
| 2015 | Audi | RS5 | Cabriolet | Rear | with 555mm Overall Length |
| 2015 | Volkswagen | CC | — | Rear Right | with 555mm Overall Length |
| 2015 | Volkswagen | Jetta | — | Rear | with 555mm Overall Length |
| 2014 | Audi | RS5 | Cabriolet | Rear | with 555mm Overall Length |
| 2014 | Volkswagen | CC | — | Rear Right | with 555mm Overall Length |
| 2014 | Volkswagen | Jetta | — | Rear | with 555mm Overall Length |
| 2013 | Audi | RS5 | — | Rear | with 555mm Overall Length; with Cabriolet |
| 2013 | Volkswagen | CC | — | Rear Right | with 555mm Overall Length |
| 2013 | Volkswagen | Jetta | — | Rear | with 555mm Overall Length |
| 2012 | Audi | A8 Quattro | — | Rear | with 555mm Overall Length |
| 2012 | Audi | S5 | — | Rear | with 555mm Overall Length |
| 2012 | Volkswagen | CC | — | Rear Right | with 555mm Overall Length |
| 2012 | Volkswagen | Jetta | — | Rear | with 555mm Overall Length |
| 2011 | Audi | A6 Quattro | — | Rear | For Cylinders 1 to 8 Only; with 555mm Overall Length |
| 2011 | Audi | A8 Quattro | — | Rear | For Cylinders 1 to 8 Only; with 555mm Overall Length |
| 2011 | Audi | S6 | — | Rear | For Cylinders 4 to 5 Only; with 555mm Overall Length |
| 2011 | Volkswagen | CC | — | Rear Right | with 555mm Overall Length |
| 2011 | Volkswagen | Jetta | — | Rear | with 555mm Overall Length |
| 2010 | Audi | A6 Quattro | — | Rear | For Cylinders 1 to 8 Only; with 555mm Overall Length |
| 2010 | Audi | A8 Quattro | — | Rear | For Cylinders 1 to 8 Only; with 555mm Overall Length |
| 2010 | Audi | Q7 | — | Rear Right | with 555mm Overall Length |
| 2010 | Audi | S6 | — | Rear | For Cylinders 4 to 5 Only; with 555mm Overall Length |
| 2010 | Porsche | Cayenne | — | Rear | For Cylinders 1 to 3 Only; with 555mm Overall Length |
| 2010 | Volkswagen | CC | — | Rear Right | with 555mm Overall Length |
| 2010 | Volkswagen | Touareg | — | Rear Right | with 555mm Overall Length |
| 2009 | Audi | A3 Quattro | — | Rear | with 555mm Overall Length |
| 2009 | Audi | A6 Quattro | — | Rear | For Cylinders 1 to 8 Only; with 555mm Overall Length |
| 2009 | Audi | A8 Quattro | — | Rear | For Cylinders 1 to 8 Only; with 555mm Overall Length |
| 2009 | Audi | Q7 | — | Rear Right | with 555mm Overall Length |
| 2009 | Audi | S6 | — | Rear | For Cylinders 4 to 5 Only; with 555mm Overall Length |
| 2009 | Audi | S8 | — | Rear | For Cylinders 1 to 5 Only; with 555mm Overall Length |
| 2009 | Porsche | Cayenne | — | Rear | For Cylinders 1 to 3 Only; with 555mm Overall Length |
| 2009 | Volkswagen | CC | — | Rear Right | with 555mm Overall Length |
| 2009 | Volkswagen | Touareg | — | Rear Right | with 555mm Overall Length |
| 2008 | Audi | A3 Quattro | — | Rear | with 555mm Overall Length |
| 2008 | Audi | A6 Quattro | — | Rear | For Cylinders 1 to 8 Only; with 555mm Overall Length |
| 2008 | Audi | A8 Quattro | — | Rear | For Cylinders 1 to 8 Only; with 555mm Overall Length |
| 2008 | Audi | Q7 | — | Rear Right | with 555mm Overall Length |
| 2008 | Audi | RS4 | — | Rear | For Cylinders 1 to 4 Only; with 555mm Overall Length |
| 2008 | Audi | S6 | — | Rear | For Cylinders 4 to 5 Only; with 555mm Overall Length |
| 2008 | Audi | S8 | — | Rear | For Cylinders 1 to 5 Only; with 555mm Overall Length |
| 2008 | Porsche | Cayenne | — | Rear | For Cylinders 1 to 3 Only; with 555mm Overall Length |
| 2008 | Volkswagen | Eos | — | Rear Right | with 555mm Overall Length |
| 2008 | Volkswagen | Eos | — | Rear Left | with 555mm Overall Length |
| 2008 | Volkswagen | Passat | — | Rear Right | with 555mm Overall Length |
| 2008 | Volkswagen | R32 | — | Rear Right | with 555mm Overall Length |
| 2008 | Volkswagen | Touareg | — | Rear Right | with 555mm Overall Length |
| 2007 | Audi | A3 Quattro | — | Rear | with 555mm Overall Length |
| 2007 | Audi | A6 Quattro | — | Rear | For Cylinders 1 to 8 Only; with 555mm Overall Length |
| 2007 | Audi | A8 Quattro | — | Rear | For Cylinders 1 to 8 Only; with 555mm Overall Length |
| 2007 | Audi | Q7 | — | Rear Right | with 555mm Overall Length |
| 2007 | Audi | RS4 | — | Rear | For Cylinders 1 to 4 Only; with 555mm Overall Length |
| 2007 | Audi | S6 | — | Rear | For Cylinders 4 to 5 Only; with 555mm Overall Length |
| 2007 | Audi | S8 | — | Rear | For Cylinders 1 to 5 Only; with 555mm Overall Length |
| 2007 | Volkswagen | Eos | — | Rear Right | with 555mm Overall Length |
| 2007 | Volkswagen | Passat | — | Center Right | with 555mm Overall Length |
| 2007 | Volkswagen | Touareg | — | Rear Right | with 555mm Overall Length |
| 2006 | Audi | A3 Quattro | — | Rear | with 555mm Overall Length |
| 2006 | Volkswagen | Passat | — | Center Right | with 555mm Overall Length |
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