changed pcv, fuel filter, and after I changed iac code 1166 came on. maf supposed to be new.

Question

Car running little rough and put ac on rougher.

since just bought 2003 kia rio 1.6, dealer changed maf (?)> I decided to do maint so I changed pcv, fule filter. I changed the IAC and THEN 1166 code came up.......
what did I do ??

took it to have check, they used smoke test, no leaks..

help !

Answer 1

I would say its most likely mass air flow sensor related or oxygen sensor 

you can try to clean the mass air flow sensor with mass air flow sensor cleaner