If you have no dealer nearby then you need to buy a code reader (Peake is very good) or the complete diagnostic software/hardware package and a Bentley Repair Manual. Once you read the codes then you'll have a better idea of what you need to address to rectify the problem.
If you do a search online for OBD II Code you'll see the list of possible problems and just how many things that could be wrong to trip the light. To start throwing parts at your vehicle in the hope of curing the problem will turn out expensive and frustrating. You'll also need at least the Peake to turn off the light.

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i