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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
sorry to sound dumb, but for my own knowledge what is a code check?
You don't have to apologize for being dumb. It's probably not your fault.
They're talking about the error codes that are stored when soemthing goes wrong with teh car, or when teh car thinks something is wrong. Basically, when you see the Check Engine Light come on, that usually means the computer thought something was wrong and it generated an error code. These codes get stored so that when you take it to a mechanic, they can hook up a device and "pull the codes" to see exactly what is wrong.
That's it in a nutshell. It's a bit more complicated than that (as far as codes that trip the CEL, ones that don't, different types, etc) but that's the basics.