My car has codes P0492 P0443 p140A P0444

First code P0492 Secondary Air Injection System Insufficient Flow (Bank2)
P0443 Evap Purge Valve Circuit
P140A Secondary Air Injection System Insufficient Total Flow (bank1 and bank2)
P0444 Evap Emission System Purge Control Valve Circuit Open

I think you might want to take this on to a shop, These are EGR and fuel tank vapor EVAP codes. There may be a wiring problem or problems with the valves or controllers themselves. This system has to be diagnosed by someone who knows and has the proper scan tools to test everything. You cannot just throw parts at this and hope to fix it. They are emissions related also so you wont be able to pass inspection with it like this unfortunately.

For the P0444 first try tightening your gas cap, and see if that code comes back, it has to do with the Canister purge system. It takes vapor from the gas tank and sends it into the intake manifold to burn, but if theres any leaks it will set EVAP codes like this. As for the P0492, you can start checking vacuum lines, this system runs an air pump, check valve for the pump, and a solenoid and a lot of vacuum lines to all these parts. On the left side of the engine compartment next to the valve cover is the pump(checking this pump the engine must be completely cold), it looks like a round cover with a big rubber pressure line coming off of it. You can take this line off and should have air being forced out of it, unfortunately all the vacuum lines for the system run underneath and behind the intake manifold and are very hard to get to. As for the white smoke, if it went away when the car warmed up, just keep an eye on it, white smoke is usually just water vapor, unless its thick and excessive. That could be a bad head gasket or anything allowing coolant into the combustion chamber. For the other codes and their systems you may want to have a technician look at it. As it can be quite a few different problems.