clackp

Recently after a lot of suspension work that was done on my 2003 S 500 I was looking at a ABS ,ESP, BAS warning replaced the sensor but still had the issue. took it in to get it checked out. The tech said it was the computer module caused by a voltage issue only was reading 2 ohms at the plug . I declined that work due to I am not a billionaire and I felt they were just going to start throwing parts at the problem. Bought a used computer with the updated model # that was not the issue still got the warning. checked for broken wires none I can see fuse box looks great any Ideas what this could be??? I was wondering maybe a junction box of some sort???