fitted some hid 6000k lights but only 1 came on so turned engine off and put lights on every thing was fine..........................

then it did it again but the othe side...........................then none would come on but the fault light came on turned them on and off 5 times then they both came on

.....................any body any ideas i thought the ballast but first time it was left side then it was right side then it ws both :(

when they work they look realy good got them from hids4u ..........

Which particular model did you fit? It sounds like they are not compatible with the Octavias electrical system (CANbus).