I have replaced OVP relay with a used made in Germany relay. Since that time the car is starting up and it runs too. However, the ABS light in my 1994 E320 sedan stays on all the time after I turn the key on or start the car. The self test diagnostic module (DM) 16-pin rectangular box located in front of the battery blinks six times when the button on the DM is pressed and released after four seconds. What additional diagnostic can I do to find out what is triggering the error code and why ABS light stays on all the time? Previously I was getting code 24 too, but is not there now. Some times the engine revs when idling but stabilizes and settles down in a few seconds.