P0441 CODE APPERS ALONG WITH P0420 - 2002 Toyota Corolla

The P0441 code means that the control module has detected a leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause that triggers the P0441 code.

Read more: https://www.autocodes.com/p0441_kia.html

Code P0441 seems to relate to the EVAP Emission Control System. Either there is a blockage or a leak in one of the valves (N80 or N115) or the pipes between throttle body and tank breather are broken.
Code P0704 seems to be a faulty clutch pedal position switch

Here's more info about code P0441 at ross-tech:
16825 P0441 001089
And code P0704 at ross-tech:
http://wiki.ross-tech.com/wiki/index.php/17088/P0704

Code 420 means the catalytic converter is not up to standard, which may not have any connection to your current problem.
The other codes deal with issues concerning the gas tank vent and purge controls which could be causing excessive pressure in the gas tank.
I would want to know if you have normal fuel pressure at the injectors, and if there is excessive pressure building up in the tank.

PO420- Catalyst System Efficiency Below Threshold (Bank 1) More than likely a plugged converter or exhaust.Remove the upstream O2 (it'll set a code and be real loud) and then take it for a spin and see if power is restored.
vacuum switching valve may fix the PO441 code. Replacing the charcoal canister could be another thing also. Then your PO446 is EVAP emission control system incorrect purge flow. which could a gas cap, could be a fuel pump seal or pressure sensor, filler neck.

get new gas cap it will give a p0441 code!!!

http://www.obd-codes.com/p0441

Code P0441 = evap code (auxiliary emissions control systems),You could try replacing the fuel cap first (make sure it has the double gasket), but most likely the charcoal canister has failed or you have a leak in a hose related to the evap system.

P0420 is catalyst system efficiency below threshold (bank 1)

P0440 is evaporative emission control system malfunction

P0441 is evaporative emission control system incorrect purge flow

misfiring can cause a P0420 code.
I would recommend a set of honda plug wires and plugs if the P0420 code returns.
I have used bolt in aftermarket bolt in catalytic converters but don't remember the brand name they fit ok and i have had 1 or 2 return with a P0420 code out of about 20. I have never replaced the oxygen sensor on a civic like yours.
I always fix the misfire problems, reset the computer, and have the customer drive it and see if the code p0420 returns. 50% don't have the P420 code return. drive it and see what happens and go from there.

P0420 indicates you have a catalyst efficiency issue; replacement of the Air-Fuel Sensor should take care of that;
The P0441, P0446 and (I assume P0440); you said 446 twice, indicates a faulty or loose fuel cap; it is not sealing properly.
Please feel free to respond to me if you have any further questions.
A FixYa rating from you regarding my assistance would be greatly appreciated.