To the second question:
How can I figure out if the TSB applies? If it does apply, how can I
find out for myself if the reprogramming has been done or not?
Apart from experiencing the fault described by the TSB and assuming that is the cause, you cannot unfortunately.
More guess work- if you know the dealership which the previous owner used, they may ...
I have just had a Mercedes Key that would not unlock the doors but would start the Vehicle.
So I sent it to a specialist car key doctor This is what he found.
Check out Mercedes Smart Key, find damaged casing and switches and bad connections. Remove all switches and fit 3 new switches, redo bad
connections, fit 2 new batteries and test, key working but ...
I am not sure how to do it yourself, but companies such as KP Technologies make modules to do almost all of the functions you would like to use.
Note: I am in no way affiliated with this company, nor have I ever tried their product, but I have seen them mentioned on various forums.
The correct TSB is ITB14-051.
Does your car have intelligent cruise control/forward collision warning?
Is the DTC C1A27 stored in the computer?
Is the brake fluid level normal?
Is the car AWD? was it built before 5/2014?
Is the car FWD? was it built before 8/2014?
If these apply than your car is covered under the TSB.
As to how to check if the fix has ...