I've encountered EWS problems several times over 4 years, whenever

• 1) I try to troubleshoot for extended p[eriods without the engine running (my M54 averages 14v at idle-1500rpm),
• 2) I try any troubleshooting if my battery is low, dying, or near dead (even my Foxwell scan tool doesn't work correctly, usually only readin a partial list of modules), and
• 3) my key is giving me intermittent contact problems (I may have to flip the OEM "damaged but repaired" key over and try again, or "hold my mouth right", or just give it a rest 'til another day)

My usual workaround is to attach a 20amp "stable power supply" and try again, monitoring the battery voltage until it's over 13v when I try, and that has worked up until recently. My single OEM key started being unreliable, despite the 13+v, so I finally bought a new Valet key, so I can take apart my old key for possible repairs, and still be able to start the X, while the repair is being attempted.

Since my X is down due to a bad fuel system, and i've had health problems causing me to not rush repairs of the X or the key, the X is sitting on a good maintenance charge, and the Valet key starts it every time, without fail.

Perhaps your X needs what mine did/does (more power & a known good key), and then you can chase down the real problems.

P.S. my EWS codes all went away everytime the battery SOC got better, sometimes immediately and others after a few starts.

__________________
01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide