There are about 30 codes that can be read on an 2.7 US car without any special tools. Federally mandated OBD II codes are associated with emissions. There are a tons of codes that are manufacture specific and, while a generic OBD II reader may or may not retrieve them, they are useless if you can not get the manufactures code designation.
If you are going to tell someone how to remove a bolt you should at least know which way to turn the wrench.
85 308 GTB QV red/tan (original owner)
95 F355 Spider SwatersBlu/tan