FLAGGED FOR FURTHER CLARIFICATION, ERRORS AND CONTINUITY ISSUES. THE PAGE NEEDS LOTS OF ATTENTION AND POSSIBLE REARANGING.Edit
OBD Or On-Board Diagnostics Edit
On-Board Diagnostics can sound like a scary entity, however, it is anything but. It is a set of self diagnostic systems installed on all cars within the US from 1996 forward and is called OBD2 for short. Wait why the 2? The 2 is because there is a OBD1 equipped on earlier models of vehicles when emissions first started to be introduced. It is a very limited diagnostic system and contains very little functionality and does not go very in depth. It ''can'' give you some stuff to help if the car is having issues but generally gives no information unless its related to the emissions. From here on out we will be discussion each type of OBD seperatly as they are read and utilized in different manners.
OBD is very specific to each manufacturer. You will need to find and follow the steps for each manufacturer in order to display the codes.
Common Locations by Vehicle
EFI Trucks 1987-95 were located behind the air filter box.
EFI trucks 1985-86 were located on the passenger side fender.
Mustang 1986-95 were located along the drivers side fender by the firewall.