or, search ebay for inpa and cables, and you will find something from romania for about $30-50, that comes with a cable and some disks... those disks are not 100% dealer equipment equivalent (there are still, some pieces that are waaaay too expensive, so only dealer and higher end indys would have) but not 5% what the local autostore has either (the store code reader reads only a handful of generic codes) - you can read a lot of codes using the sw that comes with the cable, and cut your chase down a bit... once you have a code, you will know where to look further... 4x4 light is a function of the ABS module, and can be anything related to the stability of the car, from the steering angle sensor, to the yaw sensor (below center console) to the speed sensors to the ABS module itself or the wiring in-between... with the code, you can eliminate some of the possibilities and focus on the most likely issue...