How do you diagnose your OBDII on a 1999 jeep wrangler sport?
There should be a plug on the far left of the driver's side
under the dash. You will need to plug an OBD II code scanner into
that plug. I have an Acutron scanner that I bought at an auto parts
store but there are several brands available. My scanner came with
a CD that lists all of the potential problem codes on your PC. Once
you read the code from your scanner, you just look it up in the
code list to determine your problem. A scanner is worth having
because the trouble light on a Wrangler can point to about 80
different malfunctions. I paid $100 for a diagnostic test to tell
me that my gas cap had a crack in it!