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Yes. But you will also need the climate control, evap canister and the blower. It takes about 16 hours to install.
There is not really a way to tell you how antifreeze got on the Honda Civic ex. You will have to be more specific on where you found it on the back the car. Have the cooling system pressure tested. That may make the leak more obvious.
EVAP Emission Control System Leak Detected (Control Canister System)
tighten or replace your cap
The evap control valve is on the cannister
Trouble code P1456 means: EVAP Emission Control System Leak Detected (Fuel Tank System)
The code specifically means P1457 Evaporative Emissions (EVAP) Control System Leakage (EVAP Canister System). These can be very tricky to find. First thing and cheapest thing to do is replace the gas cap and then see if the check engine light goes out after your drive it enough or have the light reset. If that does not work then you need to take it to a shop and have a smoke test run.
What I found was P1459 EVAP Emission Purge Flow Switch Malfunction It could be part of the vacuum circuit that purges gasoline fumes from the fuel tank.
you have to remove the clove box and glove box frame and then remove the evap. Its attached to it.
Take it to the mechanic
Trouble code P1457 means: EVAP Emission Control System Leak Detected (Control Canister System) Need to check the EVAP canister for leaks in the hoses
Honda code P1457 means EVAP Emission control system leak detected (control canister system)