[viper92677]

My suggestion is to change the Overload Protection Relay and your ABS problem should be solved, I had the ABS light on my 93 300E so at first, I changed the ABS Relay in the unit itself and that didn't cure my problem, then I changed the OVP and my ABS problem including my Cruise Control issues were solved. The Relay was about $40 so its not a bad choice to replace it if its Origional, Best of luck, I hope I was able to solve your problem. The relay should be behind your battery under the plastic, attached to the right side of the ECU, it has a white top with a 15amp fuse in it.

 

[viper92677]

Is the 300E the same as the 400sel the battery is in the trunk, so the relay is in the same place? My car is 100 miles away right now and I can't check it so I am asking. Also am very curious about rear abs sensors. The only thing connected to my rear hubs are Brake wear sensors and hydraulic brake lines. I bought the car new so nothing has been taken off. Could it be located somewhere else on the rear. The 400sel does not have traction control the 600 and 500 did.

I was doing some research and your 400 SEL doesn't seem to have the OVP, it wouldn't hurt to see if the Relays in the ABS unit are working, they are cheap, just make sure you have the part numbers off them.