# Service bulletin A171670 2040644\-

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10119816
- Published by NHTSA: 2017\-10\-21
- Manufacturer's number: A171670 2040644\-
- Manufacturer's date: 2016\-03\-18
- NHTSA component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE \(PCV\)

## NHTSA's summary

A metallic whistling or grinding sound is heard from the engine compartment when the vehicle is at idle speed. The sound usually occurs when the engine is warm. The MIL is sporadically on due to DTCs being stored in the ECM. A leak in the crankcase breather module can cause this condition.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2016/MC-10119816-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2016/MC-10119816-0001.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine, Exhaust and emissions, Crankcase ventilation \(PCV\)

## Vehicles listed

- 2013 to 2016 AUDI A6
- 2013 to 2016 AUDI A7
- 2013 to 2016 AUDI A8

## Other bulletins for the same vehicles and component

- [A1720072060033\_1](/bulletins/10177761.md), 2020-08-06, Service bulletin: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE \(PCV\). This bulletin contains repair instructions for when there are noises in the engine compartment with DTC P052E00.
- [AWA 19\-03](/bulletins/10160829.md), 2019-06-06, Service bulletin: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE \(PCV\). This bulletin explains the warranty extension for the crankcase ventilation valve on certain 3.0L and 4.0L vehicles.
- [A171893 2040644\_](/bulletins/10138314.md), 2018-05-21, Service bulletin: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE \(PCV\). This bulletin provides repair instructions on diagnosing and replacing a leak in the crankcase breather module.
- [A171783 2040644\-](/bulletins/10128369.md), 2018-02-05, Service bulletin: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE \(PCV\). This bulletin provides repair instructions on diagnosing and replacing a leak in the crankcase breather module.
- [Campaign Circula](/bulletins/10123631.md), 2017-11-17, Service bulletin: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE \(PCV\). On certain Audi vehicles with 2.0L TFSI engine, the diaphragm of the crankcase pressure regulating valve may have been damaged. Inspect and, if necessary, install a repair kit for the crankcase pressure regulating valve.
- [Campaign Circula](/bulletins/10123630.md), 2017-11-17, Service bulletin: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE \(PCV\). On certain Audi vehicles with 2.0L TFSI engine, the diaphragm of the crankcase pressure regulating valve may have been damaged. Inspect and, if necessary, install a repair kit for the crankcase pressure regulating valve.
- [A171780 2040644\-](/bulletins/10118414.md), 2017-10-04, Service bulletin: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE \(PCV\). This bulletin provides repair instructions on diagnosing and replacing a leak in the crankcase breather module.

JSON: [/v1/bulletins/10119816](/v1/bulletins/10119816)

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