2006 lincoln town car code p0428

Question

engine light is on, thermostat replaced, still on?

Answer 1

P0428 Catalyst temperature sensor high input Bank 1

P0428 is not valid for the Town Car. you probably meant P0128 if you changed the thermostat. , which would be for coolant thermsotat below requlator temperature . Check the coolant level for any leaks. , what can also set this code is a inoperative coolant temperatue sensor

Here a coolant temperature sensor on a Ford 4.6 . Even after a new thermostat was replaced the code P0128 persisted. a replacement of the engine temperature sensor solved the code P0128