hi i have just changed the ecu transponder and ignition barrel on my bravo, the car is running fine, however when i start the car their is a light that appears in the bottom left that looks like a square with 3 spray lines coming out of it and it hasnt gone off.

i noticed that before i changed the ecu the light would just come on for a couple of seconds and then it would go off just like the key code light does.

please can you tell me if this is bad news or if there is a way to fix it cheaply.

thanks

Thats your engine management light. It means its detecting a fault from the ecu

Get a diagnostic test done