hello guys i an seeking any info on a problem my pal has asked me to look into for him the car has dropped in power and under warranty it was checked by audi and they said this engine has a known problem of the inlet valves having a build up of carbon on the inlet valves and this is the reason for the loss in power i was wondering if anyone can through some light on this for myself manny thanks. jim

Interesting read and info here;https://www.more-bhp.com/20tfsi_42fsi_rs4_carbon_valve_cleaning.html

hello there thanks very much for your help i will pass this info on and hope we can solve this thanks again.jim

so sorry for the delay in replying the car was remapped and problem has gone thanks for the help .jim fixed