2000 s40 - Engine error codes

[happikoto]

I have two fault codes of of which I had "repaired" awhile ago. I wipes the codes and the car ran well but after a week (and I assume the you drove enough miles reset) the code came back and the engine started to feel different.

p0133 - O2 sensor
p0014 - "b" camshaft position

I had both o2 sensors replaced and the camshaft position sensor replaced recently the problem went then came back. I read somewhere that removing the factory radio without disconnecting the battery (ya I was dumb) can cause some odd error codes. I was told that Volvo can do some sort of re flash of something to reset these coded. Is this true if so what would I tell them I needed? I need to get my car inspected in a week so procrastination has gotten the better of me and now I need help.