Originally Posted by Mutt's37Buick
Thanks for the info.
Can anyone tell me if there is a foolproof way to tell if a car has OBDII or OBD1 diagnostics by looking at the car.
Well an OBD-II system has a specific port in it for identifying codes, where the OBD-I system usually requires you to make a connection with a wire or paper clip in it's diagnostic port and read the CEL Flashes. Though I have a friend with a 95 cavalier that has an OBD-II style port in his car that he claims gives OBD-I codes. FWIW, the port looks like this and is usually found under the dash, drivers side: