Subaru Legacy 2016–2019 — technical service bulletin
Bulletin 09-109-23 · NHTSA communication 10240121 · issued Jul 25, 2023
Technical service bulletin
communication type
Equipment
component
2016–2019
model years
8
vehicle entries
Official summary
This bulletin announces diagnostic procedures along with availability of new Engine Control Module (ECM) reprogramming files to address DTC P2404 (Evap System Leak Detection Pump Sensor Circuit Range/Performance) detection.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.