99 may be too old for this trick, but for some Chrysler's turning the ignition from off to accessory 3 times will pull the codes and display them in the odometer display.
Here's a random youtube vid on it:
I've got a sightly newer dodge ram and it works great.
one of the best tools is to use the Greasemonkey extension in Firefox. There are several scripts that make browsing craigslist much easier. Google Chrome should run the scripts too w/o the need for Greasemonkey.
Step 1:
install Greasemonkey for Firefox...