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With a new valve gasket
Remove the head and have the valve reseated or replaced.
The car code p0446 is a faulty vent valve. To fix this problem, the vent valve will need to be replaced.
Replace the valve seal and check the valve guide for wear.
depending on your mileage, if you have less than 80,000 miles or car is not older than 8 years old the dealer will actually fix it for free. Honda extended the warranty for that. if not it gets complicated you have to remove the intake manifold and drill out the egr passage then replace the valve.
You don't fix it, you replace it.
The best way to fix an expansion valve for the A/C system is to replace it. of course then you have to evacuate and recharge with freon.
Go to youtube, search for Davidsfarm, and he shows how to fix a valve.
P1776, solenoid switch valve latched in low/reverse position. The usual cause is dirt in the transmission valve body.
replace the egr valve
You need to put a vent and a PCV valve in the valve covers.
get a new v sleave