A metallic whistling or grinding sound is heard from the engine compartment when the vehicle is at idle speed
Audi technical service bulletin A171566 2040644- for 2013-2016 Audi A8, 2013-2016 Audi S6 and 2013-2016 Audi S7 and others.
- Bulletin number
- A171566 2040644-
- Component
- Engine and engine cooling
- Summary
- Supersedes Technical Service Bulletin Group 17 number 15-64 dated June 3, 2015. A metallic whistling or grinding sound is heard from the engine compartment when the vehicle is at idle speed. The sound usually only occurs when the engine is warm. The MIL is sporadically on. DTCs are stored in the ECM. A leak in the crankcase breather module (pressure regulating valve) can cause this condition.
Owners of these vehicles have filed 202 complaints in the engine category.
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