Hi, im new to this forum so any help would be appreciated

Recently when i accelerated i noticed that the engine managment light came on, so i was told to turn the car off for a while & start it again but it is still showing. I have also tried resetting the ECU buy disconnecting the negative terminal & holding down the brake for 30 secs but still no joy.

The car still drives fine so im not sure what it could be....

I read somewhere that it could be the transmission oil running low. Anyhelp would be appreciated & it also has a stage 1 tunning which has been installed for over a year now. My car is an 01 WRX