Error Codes

Hi,
I have just got TuneECU and ordered the link cable as I have the engine management warning light illuminated and thought it would be a good opportunity to learn how to analyse faults rather than pay the garage a huge sum, just to tell me what's wrong....
I have a 2010 R111 Touring and wondered if there was a list of fault codes anywhere that I could download and keep?
I have looked on IDK's resource page and couldn't find anything - though I could be looking for the wrong thing!!
Thanks all - stay safe

obdII codes is general codes i use this site for comparison

probably best to just list all the codes u have and wait for answers.