@ Takimo.

I would recommend finding a shop to read codes from the OBD port. If you want a very easy to use BMW solution, buy the CarlySoft "dongle" to pair to your smartphone. The software can be downloaded (iOS and Android versions) for free, you have ONE free lookup before the modest subscription fee. For a modern car, you need the appropriate tool. I own and use Carly. It is also very handy for coding as well as normal diagnostics. Excellent value for money.

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2002 Euro X5 (E53) 3.0 diesel (M57)
5 speed manual with UUC short shifter.
Pre-xDrive NV125 transfer case (chain & gears).
Factory Xenon headlights, Spyder LED tail lights
Updated vortex crankcase breather.
Motorsport dead pedal, factory fire extinguisher, factory first aid kit, factory F&R mud flaps, factory PDC

Bilstein B6 shocks F&R
Redline oil has replaced "lifetime" fluids (F&R diff, manual transmission, transfer case and P/S).
Dimple magnetic drain plugs in all compartments.