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Message: <blockquote data-quote="publicbus" data-source="post: 188518" data-attributes="member: 4310">My ride is e39 523i 2000. I once had the ABS and EML lights came on. Initially it was intermittent. Sometimes both lights went off on the next start. When both the lights stay, I experienced loss of power (cant drive faster then 60 kph). From intermittent it became more and more frequent. Went to a 1st mechanic, the diagnostic pointed to ABS problem. Went to another mechanic, diagnostic pointed to EML. Went to AB, and they had a thorough check. Check related wiring and suspect the O2 sensor. Cleaned the O2 sensor plus changed a relay and the ABS light gone. Left only the EML.  AB was professional enough to check for other possible problems and eventually identified EML as the culprit. Changed the EML and the problem resolved.Better have AB to check so that at least you changed the correct part.FYI, EML from AB is about 1800. ABS control unit from AB= more than 4K (verbally told, outside mechanic will charge about 2800 and about 150-200 for labour charge) and O2 sendor  from ABabout 1500 (about there, cant remember actual figure).My advise, for such problem, get AB to look into. I have to pre-warn that changing those parts are easy and fast, but have to wait a couple of days as AB needs to order form Johor or Spore.Good luck</blockquote>