Depends why the Failsafe was triggered. Read the codes would be a good way to start. Anyway, since the car wont start, it may be the crankshaft position sensor, which will cause a trans failsafe and prevent the car from starting.
SOURCE: 1998 BMW 740IL WILL NOT START
This happened to mine.
I took it back to the place where i bought it and at this time i still had warranty on it, they went and looked through it and found that the battery cables were bad.
Hope this helps
SOURCE: BMW X5 Trans Fail Safe Program,
sometimes it will clear if you turn the X5 off and restart it. however, it could be an early indication that the tranny is about to expire. i have had it happen and it cleared with a power cycle, but also had friends where it cleared for a few weeks/months and returned. this time it was really the transmission that went bad. if you can't get it to clear, then i'd suggest taking it to the dealer and have them plug into it to have a better look.
SOURCE: My 2004 Linc Ls keeps going into this fail safe
Sounds like your mass air flow meter is at faul.Replace it.Good luck.
SOURCE: 2006 BMW 325i E90 remote programming
That remote you purchased, did you remove your vehicle key from your old one and insert it into the new one? At the back of the remote there are pinch grips, pinch and pull to remove the key, you should have a plastic version of this key for your car, in the spare in the glovebox, unless it has been removed, check also in the owners manual folder, if you bought this car used it maybe in there. If you do not have the kaey that matches your car to put in the remote it will not program to the car. Hope this helps, let me know.
SOURCE: fail safe engine mode
i had this problem last week and i changed my oxygen sensor under the engine not the one on the side see what number sensor does the diagnostic give no1 is side of engine and no.2 is under engine
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