Hey I just bought a 92 integra about a week ago. It seemed fine but then at random times the car won't start. I'll wait a few minutes try again and it'll start up no problem. When the car doesn't turn on S3 flashes on the dash. Can someone please help and tell me what this could mean? Also maybe how I could go of fixing it. All feedback is well appreciated, thank you

 

Main relay, I'd be willing to bet. It's under the driver side dash. Either buy a new one or resolder the old one.

 

I believe the main replay is okay, is there anything else is could be?

 

Yeah, there's 10 or 20 things that it could be. You can find the manuals here.
Good Luck.