P CODES (POWERTRAIN) P0500 - P0599 Questions

After Getting Code P0599, I Found A Leak At The Thermostat And Water Pump, Replaced Both, Checked For Leaks And Found None. Drove The Car...

Im Due W/ Smog Check.can't Pass X2 After Even Changing The Coolant Thermostat.we Already Went To 3 Service Centers.seemed Like This P0599...