how do i see what code the check engine light is throwing thanks for help

It's very simple just follow the instructions.
http://www.cygnusx1.net/Supra/TechTips/engine_error_codes.aspx

I use a diagnostic tool called CarMD. It will pretty much tell you whatever is wrong with your car as long as it is a 1996 or newer. It costs about $90 and it plugs into the On-Board Diagnostics (OBD-II) port. Very easy to use.

Heres a link to the site if you want to check it out: http://www.carmd.com/

Hope that helps!

1988 Supra