a friend of mine has just changed the air filter housing, and in his words reset everything. He is getting a fault code and has just sent me the following fault information

Control Module Part Number: 06A 906 018 CD
Component and/or Version: 1,8l R4/5V MOTR HS V01
Software Coding: 04000
Work Shop Code: WSC 06435
1 Fault Found:
17916 - Idle Control Sys: Upper Regulation Limit Reached
P1508 - 35-00 - -

He has a 1.8 A3. Does anybody know what this means?