I have 2006 Cerato 1.5 CRDI. I haved some minor problems (irregular cold idle, lack of force when start on cold time, white smoke on start, lot of smoke when powerful accelerating...). But recently i start to have check engine light (depollution). It cames during one or two days and then gone. I buyed a ELM327 OBDII diag and with torque software i can see the stored code error is P1117. What means this code in Kia engines?