At the moment the GPF light is lit permanently, with a message informing me to continue driving for filter to regenerate. During this period, if filter doesn’t clear, the car then runs lean, forcing more O2 through exhaust which worsens mpg even further. The next stage –
Taken from the manual – “If the GPF warning light stays on or the warning message “Check exhaust system” pops up even after driving at recommended speed and for recommended hours, visit a professional workshop and check the GPF system. Kia recommends to visit an authorized Kia dealer/service partner. Constant driving with the GPF warning light on can damage the GPF system and undermine fuel economy.”
I did read somewhere that it does go in to limp mode, but can’t find it in manual, so not sure.