yep, i've had the same. check the top of your steering res. first. chf 11s does seem to be the most common but a bmw tech told me there is another code ??? cant remember what it was now but something to do with what suspension set up you have. ???
also check your battery condition. these cars throw up all sorts of warnings. sometimes you just need to turn off , wait a few mins then start up again and all back to normal.