I have a 1999 bmw 328 1999 and the abs and traction control lights are on.

I've had it plugged in to 3 diagnostics and nothing is reading it doesn't pick a fault up

If the light is on it has to have a code. have the scan tools been able to communicate with the ABS module? or do they communicate and say no codes? if communication is good the scan tool will show live data of all sensors and problem can be pinpointed that way. if you are using a tool that is just a code reader they do not read all codes, must use a good scan tool.

I will ask the mechanic who looked at my car and let you know tomorrow thank you for your help