<knock on wood> that i won't be needing one of these in a LONG time.....but I have 3 vehicles (2 Jeeps, 1 Toyota) that my husband and I will do most of the work on.
The Toyota uses an OBD II type scan tool that you plug into your computer port to pull engine codes to find problems.
What scan tool does Jeep use?
And will it work on all Jeeps including 92 (Wrangler) and a 99 (Grand).
It would be a miracle if they all used the same one wouldn't it??