Da-42 instructor pilot reported left engine flameout on 3 mile final.

Attributes
ACN	1703329
Time
Date	201911
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	DA42 Twin Star
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	Powerplant Fuel Control
Person 1
Function	Instructor Pilot Not Flying
Qualification	Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Multiengine Flight Crew Instrument
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

Student was flying the aircraft. On about a 3 mile final for 9L at ZZZ the aircraft yawed to the left; began beeping and showed both a left ecu a failure and a right ecu B failure at the same time. Instructor took controls of the aircraft and determined left engine failed. Requested priority handling feathered the left engine and made a safe landing. After exiting off taxiway; an attempt was made to restart the left engine. Engine started back up but both ecu failures remained. Taxied back to parking.

Original NASA ASRS Text

Title: DA-42 instructor pilot reported left engine flameout on 3 mile final.

Narrative: Student was flying the aircraft. On about a 3 mile final for 9L at ZZZ the aircraft yawed to the left; began beeping and showed both a Left ECU A failure and a Right ECU B failure at the same time. Instructor took controls of the aircraft and determined left engine failed. Requested priority handling feathered the left engine and made a safe landing. After exiting off taxiway; an attempt was made to restart the left engine. Engine started back up but both ECU failures remained. Taxied back to parking.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.