codes,codes,codes

got my daughter a99 vw bettle used of course had about 5ok miles on it, runs god but the engine light came on put about 1500 mile on car since purchase on had codes po 140,300,302,304,411 and 423. no idea what 423 is. if there is a problem from other codes they seem to be related.unless someone can tell me otherwise im sure i can fix it with your help. i cleared the codes to see what will come back. oh yea the engine light had come on once before but cleared itself be for i got it checked. please help and advise