Phil Webb

hi all, new to audi world and indeed to audi. got my first audi but have a problem and not sure where to post, so apologies if in wrong place.

my check engine light came on and i took it to halfords for a diagnostic check and it came up with fault code P106B which wasnt listed on halfords computer.
so 3 questions really.

1 what does this fault code mean
2 will the engine be damaged if i keep driving it
3 how much will it cost to repair

my cars an audi a6 allroad 2.7 diesel, dont know if thats relevant.
any help gratefully accepted, thanks.