??
Its either on or its not. You can make the car run at least for a while, right? Once the car is running is the light on or not? (It always lights up w/ the other dash lights when you first start it up).
You need to get the error codesout of the computer. If the car will actually go, many large-chain auto parts stores will read these for free. If you can’t get the car there you can either buy a cheap code reader ($60 or so) or some places will loan them out - which usually means “buying” one and getting a full refund when you return it.
The codes look like this: “P1234” - you need those exact codes.