Do I need any ECU tuning after timing chain replacement?
 

I have Mini Hatch One (07/1.4/MT)
​​​​​​First thing I've done after purchasing it about a month ago was timing chain replacement due the famous "cold start Death Rattle" which somehow was ignored by previous owner.
​​The car is running much smoother, however Check Engine light is still on and the RPM on intersections sometimes goes up and down between 500 and 2500. I bought the simplest code scanner, it reads B2AAA, P0014, P0015, P2626, P0141. I already changed both solenoids with the new ones and switched camshaft sensors in places (the error codes still point to Exhaust).
I read online that on Citroens and Pegeots that have similar engines mechanics do some sort of ECU adaptation, or limits remapping, or VANOS relearning after timing chain replacement, not sure what would be the appropriate word for this procedure. Is it the same for Mini? Should I go to the local shop that specializes on Mini and ask them to do that for me.
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If you've replaced both VANOS solenoids and the cam sensors it could be a couple of different things: timing jumped (which is possible), the sealing rings on the camshafts for the VANOS oil pressure passage may be worn (not very common). Is there oil in the car?

Who did the timing chain, and was it done with the proper tools and literature?

The cam position often takes more than one set up, there are youtube vids showing someone having to put the cam lock tools on a few times and retighten the sprocket bolts up in order to establish correct timing. Sounds like you are at that stage now. Just logical that if all the codes pop up after the new chain, they are being generated because it is not set up correctly. Take it back to the shop.

finally
 

The answer on my initial question turned out to be YES for my case. I found local shop, they did the firmware reprogramming (took a few hours and tries) and it solved the issue. Basically for the exhaust camshaft the normal degree range is from 40 to 60. Mine was 19. After reprogramming straight 50.
They couldn’t explain how it happens and told they’ve actually never seen 19 degrees before, sort of high score..((