I have a 05' Hyundai Santa Fe.The ABS light & TCS light come on after I go about 3 miles or so, I dont seem to feel anything wrong with the vehicle though, runs just as always? whats wrong?

Pull all the ABS wheel speed sensors and clean off any metal or dirt you find attached to them (they are magnetic "hall effect" sensors). Check the wiring to them as well.

Whenever this warning light or any other stays on in the dash it is indicating that the systems control module (or the system sensor in the case of lights like low oil pressure, door open indicators etc.) has detected a fault, it then disables the system (this applies to ABS,TCS, TCM, SRS and BCM faults and others) as long as the light is on. You must now have the dealer hook up a special electronic diagnostic tool and "scan" the system for the fault code that is stored for the problem(s)

Legend of Abbreviations. ABS Antilock brake system.TCS Traction control system, TCM Transmission control module, SRS Supplemental restraint system, BCM Body control module

It takes a special scanner to retrive this code, a generic handheld won't get it,

if your peddle is pulsing change the rotors they got to hot and warped do not get dealer rotors buy one after market with holes in them they cool better

Probably bad wheel bearing

you may have damaged the ABS sensor or wire to the sensor up front check the wire that runs from the inner finder well and make sure it connected to the ABS sensor on the spindle

Alt shoud be putting out 14 to 15.2 volts.

Wheel speed sensor out of adjustment

YOU MAY NEED TO TAKE IT TO THE DEALER FOR AREPROGRAMING OF THE ABS SYSTEM

haynes has one id try bleeding the brakes or replace them an bleed