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Service bulletin Circular 19P9

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10188611
Published by NHTSA2021-04-06
Manufacturer's numberCircular 19P9
Manufacturer's date2021-03-02
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

Due to a production irregularity, the cooling system in affected vehicles may have been filled with an antifreeze concentration for min. -25 degrees Celsius instead of the required concentration for min. -40 degrees Celsius.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine

Vehicles listed
AUDI A62019, 2020, 2021
AUDI A72020, 2021
AUDI AUDI
AUDI S62020, 2021
AUDI S72020, 2021

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
TSB_2083393_12026-10-05. Service bulletin. This bulletin provides information when the starter/generator drive belt is noisy or came off.
TSB_2081030_42026-10-05. Service bulletin. This bulletin provides information when there is an abnormal knocking noise from the engine compartment; V6 3.0L TFSI.
TSB_2081030_32026-09-04. Service bulletin. This bulletin provides information when there is an abnormal engine knocking noise from the engine compartment; V6 3.0L TFSI.
TSB_2082323_12026-07-07. Service bulletin. This bulletin provides informaiton when the engine is not running smoothly, misfiring.
TSB_2074640_32026-07-07. Service bulletin. This bulletin provides information when there is increased oil consumption; >0.5ltr/1000 km.
TSB_2073867_32026-07-07. Service bulletin. This bulletin provides information when DTC U140A00 Terminal 30 is stored in the ECM.
TSB_2081030_22026-05-05. Service bulletin. This bulletin provides information when there is an abnormal engine knocking noise from the engine compartment; V6 3.0L TFSI.
TSB_2081030_12026-05-05. Service bulletin. This bulletin provides information when there is an abnormal engine knocking noise from the engine compartment; V6 3.0L TFSI.
TSB_2081342_12026-04-07. Service bulletin. This bulletin provides information when there is a Drive System Malfunction, DTCs related to Knock Sensor P0327, P0332, P0328, P0333 - V6 TFS.
TSB_2070915_22026-04-07. Service bulletin. This bulleitn provides informaiton when there is a loose engine oil filler cap; P006800, P227900, P050700 - 2.0 ltr. TFSI.