Ramon, I had the same on my E32 750. One time even the plug side coming from engine room. I had a spare wire loom and just cut the plug with some wire pigtail off and resoldered it and added shrink tape, works since about 1 year without problem. Here is another sample we found on my friends 750, did the same, cut and soldered and shrink taped it
ABS Sensor Photo by shogun_bucket | Photobucket