Is there any one knows how to fix Catalytic Converter actually I do have mirage but my car isn't giving me more dan 13/14 KM before mileage was around 18 / 19 but apparently it dropped, So anyone knows about it kindly let me know I change the plugs ( High quality Plugs ) even I am using Hi Octane although speed improved but symptoms still persist I mean mileage is 13 / 14 Per Kilometer.
I research online but I am still no where if any one knows what's the issue or have knowledge what I suppose to do kindly reply me .
Thanks