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The tire pressure monitoring system in your car uses the antilock brake sensors to monitor the tire pressures. Does your car have matching tires and have the tire pressures been checked and reset procedure done? If the repair shop can't figured out whats going on, there is a professional service called Identafix. http://www.identifix.com/info/about_us.htm They only deal with professional repair shops. They are in the Minnesota 651-633-8007. Your auto repair shop do all their diagnosis tests, and discuss your problem with a team of professional technicians great service cheap and very bright people. If the repair shop that are repairing your car are stumped this is a great service. This company only deal with automotive repair shops and don't answer questions for the general public but are an amazing knowledge base.
If the ABS light is not on the computer must be seeing signals it sees as valid from the wheel speed sensors (sometimes surfacing the rotors metal shavings get attracted to the magnetic ABS wheel speed sensors giving problems. Reset procedures should be in your owner's manual. Check here http://repairpal.com/automobile-owners-manuals-online or try this link you may be able to down load a free copy of the owner's manual for your vehicle http://www.autousermanual.com/