Hello & Welcome,
Have you tried to pull the code for why the SES light is coming on yet?
The good news is you should be able to get the codes from the system usiing the following procedure, which does not need a scan tool.
Let me know how this works out and we can continue with the troubleshooting.
There are just two graphics (images).
Can you click on them to make them full size?
If you mean that you can see the procedure & figure in full size, that is what is supposed to happen. The link in the image is not clickable.
Just follow the instructions carefully and let me know what you find, then we figure out where to go from there.
That sounds like a plan.