What dose error codes 93b2 and 93d7 mean on a bmw 520d 2006 just repaired and these are the last problems

Very simple buy the book and how did you get those codes without knowing what they mean did you take it to auto zone or shucks? they wont tell you what the code means but theyll give you the code to help your very trusted auto machanic, also Ebay has a very wide variety of standard to very complex code reading machines and that would be your number one saver in money if your a Do-it-yourselfer like myself. now since i dont have the book on BMW's my guess is the mechanic didnt reset the computer before charging your last bill so get the code book on your specific model and year and go from there