Honda CBF125M Manual page 36

PGM-FI (Programmed Fuel Injection) malfunction indicator lamp (MIL)
Comes on briefly when the ignition switch is turned to the (On) position.
If it comes on while engine is running:
ECO indicator
When fuel consumption improves the ECO indicator will come on.
When the vehicle comes to a stop, the ECO indicator will turn off.
u
Activate or deactivate the ECO indicator:
(P.78)
(P.28)
33