Need some help: working on a 2006 750Li with abs light, dsc and parking brake light are on and code 5f20. speedo works fine, but with the my diagun able to read all sensor. left rear not working, replaced sensor, worked , for about 10 minutes. Now the code is back and have no other ideas? Alldata and the internet lead to air gap, but no other diagnosis. Any help would be great.
