Engine code P0118 and P0136, what is this really mean, any fixes,how do I get to clear the check engine light?

1996 Mercury Mystique LS V6. I replace both O2 sensors about 2 years ago and the temperature sensor about 2-1/2 years ago. The coolant level is good.Engine code P0118 and P0136, what is this really mean, any fixes,how do I get to clear the check engine light?
P0118


Engine Coolant Temperature Circuit High Input





P0136


02 Sensor Circuit Malfunction (Bank I Sensor 2)