At that age of car it is probably worth taking to an engine management specialist who can read the diagnostic codes for you and tell you a bti more about the faults.
At that age and low miles and the fact that it has been sat for 10 months un used probably means the insides of the engine could do with a clean out.
It sounds like the info BMW gave you mean that there is an air to fuel mix ratio problem, which could mean that a few things need cleaned out like the EGR/PCV system, this is the system that vents burnt gasses that accumulate in the crankcase and head back into the intel manifold. The camshaft sensor can be a common fault, the sensor packs up and it throws off a diagnostic code.
Did BMW reset the faults? When a car is presented for an engine management fault, the first thing you do is read the codes and record them, then wipe them, i.e. reset. Then drive the car to see if the fault re-appears then re-read the codes and record them, then tell the customer.
If your friend touched a hose and dislodged it enough for a fault to appear, it should be obvious that there is a leak from one of them and could be possible pushed back into place and the hose clip tightened back up to secure it.
I suspect that the engine is a bit sludged up from being out of use. Start with replacing the engine oil and taking for a long run to get the engine up to temperature and maintain it for a time so that you can get all the fluids and exhaust gas systems up to temperature. Also replace air and oil filters. Might even be worth swapping out the fuel filter.
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