In this case, the diesel emissions cheating affected almost 5 million cars sold by the Volkswagen group in Europe and the United States, prosecutors said.
German prosecutors served Audi a $927 million fine for violating diesel emission regulations in Europe.
Both the Audi- and Volkswagen-developed engines were engineered to limit emissions during laboratory testing, but work in a normal non-compliant state when being driven on the road.
In their own communique, Munich prosecutors confirmed their so-called "administrative proceeding" against Audi was now "closed".
"As a negative special item, [it will] reduce the group earnings for fiscal year 2018 accordingly", it said in a statement.
"Audi AG has accepted the fine" for "deviations from regulatory requirements in certain V6 and V8 diesel vehicles", the group said.
It was noted that Ingolstadt also failed to discover that EA288 (Gen3) engines in the US and Canada and EA189 engines worldwide produced by Volkswagen were advertised, sold to customers, and placed on the market with an impermissible software function from 2004.
The penalty came on top of total costs in fines, buybacks and refits of more than €27 million that Volkswagen had to pay out over its emissions cheating scandal. Former chief Martin Winterkorn and other executives face criminal charges in the United States, though they can not legally be extradited.
The Wolfsburg-based group's 2018 earnings suffered another one-billion-euro blow in June when it agreed to pay a similar fine levied by Brunswick prosecutors over its own-brand vehicles. The stock is down 11% this year. Former Audi Chief Executive Officer Rupert Stadler has been in custody since June after allegedly tampering with a witness in the investigation.