Just a thought:
if you have an iPhone or Android you can use them as a diagnostics tool.
I have an Android and downloaded an app called Torque. I ordered the module from ebay and am waiting for it to arrive next week. All in, I paid less than $30 for module and $4 for app. I have a friend who purchased this same setup and gets readings and info for both his and his girlfriend's car. They are North American and Japanese cars though. I will try to get a post on here once mine arrives to let you know if it works with our X5s.

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'03 Black BMW E53 3.0i 110,000+ miles
'03 Black Mercedes-Benz W211 125,000+ miles
'13 White Mercedes-Benz W2o4 New