ABS, DSC, Brake warning lights

[LBX5]

Perhaps someone here has ans answer for me because I am now officially stumped. Was getting the above warning lights along with a trns.fail.safe and an inactive speedometer. Changed out a new left wheel sensor and it did not fix the problem. The obvious fix seemed to be having the ECU rebuilt. Of which I had done. Got it back today, had it installed and low and behold after driving for 5 minutes the warning lights tripped on again although strangely enough the speedo works.

Any ideas on what to check next?? Could it be a bad ECU rebuild or something else?? Oh by the way, its a 2003 4.4 litre X5