I have replaced the offending wheel sensors and I am still having ABS/ASR problems , The lights go on ,then stay off for a while , When the lights are off the ASR will still function , however when I try the ABS the lights immediately come on . Also the brake light came on the other day and beeped three times. All lights are off as of today but I threw a code P 1649, data bus powertrain missing message from abs controller .What does this mean in English. I'm pretty sure It means I need A new abs unit . Thanks for any insight you can give me on this .