Hello, I just went through the whole diagnosis and fix on my ABS warning light. I thought I would share what I learned. My Car: 99 Cobra My light was coming on intermitently (at first). Eventually, the light was on all the time. From what I understand, IN GENERAL: If the light comes on when you start the car and stays on, you have a module or wiring problem. If the light comes on after the car is moving >8mph, then the problem is probably a wheel sensor. Also, there are very few code scanners that can read the ABS codes. I tried a snap-on $8000 scanner that should have worked... it would not communicate with my module... this is another sign of a bad module. FYI - Ford dealership wanted my car for the whole day just to read the ABS code!!! Even though clue #1 was a bad module, I went through the entire diagnosis anyway (hoping for a bad wheel sensor!). I cleaned all my wheel sensors then checked all the wheel sensors and grounds with a volt/ohmeter. For excellent details on how to do this for 98-99 (others???), go to: Mustang 1998+ ABS Diag Info I don't know who's site this is, but is has everything you need to diagnose the wheel sensors, fuse, power supply, and grounds. It has all the pin diagrams as well. There is even a page for 94-96 mustangs. My car passed all wheel sensor tests. Adding up the info..... Module will not communicate with ABS code reader, Light is on and stays on right after start-up, and the POS Bosch ABS modules used in these cars had an inherent weakness in the soldering joints inside the module... I diagnosed my problem as a bad module. OK, now I heard the dealership will charge $900-$1000 for the ABS module replacement. I could not find any new aftermarket ABS modules. So, I researched it and found that a nice little business has popped up for repairing these modules. Do a search on ABS Bosch Module Repair... and you will find a few: Module Masters, ect. I found a guy (seller Bosch0004) on Ebay who repairs these module for $100. Here is a link to his posting: http://cgi.ebay.com/ebaymotors/ABS-...ptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories Now, there is a video on YouTube.... you can remove the ABS module WITHOUT breaking into any hydraulic lines. Here is the link: How to replace Mustang ABS control module WITHOUT removing lines‏ - YouTube I drove my car for a week and a half with the module out.... I ziplock bagged the hydraulic unit to keep it dry and I zip tied the module to firm it up. (Drive your car at you own risk!!!). I sent my module off to Bosch0004 and he had an incredible 4 day turn around (including shipping both ways!). I reinstalled the module.... and... everything is fixed. I hope this helps those who are having a similar problem. Jim.