Audi S6 2013–2017: oil-supply strainer and turbocharger damage

Which symptoms guide diagnosis

Audi lists EPC, MIL or oil warnings, extended cranking, rough idle and insufficient power. These require diagnosis; an indicator does not show bearing condition. Not every loss of boost can be attributed to this mechanism without checking.

Audi / NHTSA repository: Audi21H7 /22V178: turbocharger oil strainer safety recall

What the remedy includes

The document prescribes strainer replacement, oil change and diagnosis checking/documenting boost-system function. It does not unconditionally replace every turbo. A new-strainer entry also does not prove old bearings were unworn.

Audi / NHTSA repository: Audi21H7 /22V178: turbocharger oil strainer safety recall

Full material about the model

Blocked strainer, bearing lubrication, Audi’s reported symptoms and why a new strainer does not establish turbo condition.