Search for OBD-I codes by the year of the vehivle.
Turn the key in the ignition. This allows data to stream from the diagnostic system to the OBD-I. This should only take a second or two.3. Read the code as it appears on the scanner's screen. Write it down and look up the code online to find a definition. There are plenty of sites that archive these codes.
1. Connect the scanner's cable to the diagnostic scanner. Turn on the scanner.
2.The 1995 Cutlass Supreme predates the contemporary procreation of on-board diagnostic codes, so the contemporary OBD-II recite tools on the marketplace, Testament not be able to cover its trouble codes. These scanners are not reverse compatible. You need a diagnostic scanner fluent in OBD-I. These tools are still available as of 2010, and can be found online. The process of checking the trouble codes is basically the same as it is for contemporary vehicles using the current diagnostic coding system.
