Discolored Pipe on Turbocharger – 2013-2018 Audi

NHTSA ID Number: 10161603

Manufacturer Communication Number: A2119322034999_4


This informational bulletin contains an explanation for a discolored pipe.


30 Affected Products


AUDI A8 2013-2018
AUDI RS7 2013-2018
AUDI S6 2013-2018
AUDI S7 2013-2018
AUDI S8 2013-2018

On 4.0l bi-turbo FSI engines, the pipe on the impeller side of the bank 2 turbocharger looks discolored when compared to the pipe on the bank 1 turbocharger.


Technical Background

The crankcase breather is only connected to the bank 2 turbocharger inlet. Blow-by gases from the crankcase breather discolor the pipe (Figure 1). This is a normal condition.



  1. If necessary, explain to the customer that this is a normal condition.
  2. Do not replace any parts due to this condition.

June 21, 2019



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HENYEE K03 Turbo Turbocharger Exact Fit for Volkswagen VW PASSAT & AUDI A4 B5 B6 1996-2006 1.8 1.8T A/R .87 250+HP Turbo Charger & Gaskets
  • Application: This K03 turbo exact fit for VW PASSAT & AUDI A4 1996-2006 1.8T
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Last update on 2019-09-07 / Affiliate links / Images from Amazon Product Advertising API

Last update on 2019-09-07 / Affiliate links / Images from Amazon Product Advertising API

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