I have a 1999 740i with teh following diagnosed problems:

-- three ABS sensors were bad

I replaced all four sensors but am still having these problems:

-- ABS/BRAKE and AST symbol are lit permanently
-- Speedometer no longer works

EXCEPT

(1) when it's really cold in the morning (2) for about 10 miles or so then it dies.
-- occasional loss of power steering..

I had the system reset by my mechanic many many times.. but to no avail. I have 4 new abs sensors installed (properly.. cleaning before installing and what not...)

Where do I go from here