C1201 - Malfunction in engine control system - ?
U0100 Lost Communication With ECM/PCM "A" - **I assume this is can be ignored :-)
P0347 Camshaft Position Sensor 'A' Circuit Low Input Bank 2
P0403 Exhaust Gas Recirculation Circuit Malfunction
P0346- Camshaft Position Sensor 'A' Circuit Low Input Bank 2

So I did homework, read the threads that came up. I pulled airbox checked hose. I'm due for an airfilter. Also re-tightened gas cap. I take my boys to travel hockey so I'd like to fix the issue before the next weekend's driving.

-How long until the codes would clear if I 'fixed' the issue?
-Just restart the car a few times?
-If codes remain is the standard best attempt to get a new OEM Denso O2 Sensor and install it?

FWIW the temp has dipped and we have been in the 20's and teens a fair bit - quite code :-)

Anyone want to help steer me one way or another?

 

Disconect your battery for 30 mins and It will do a hard reset on the cars ecu and it will have to re-run all the test that led to your check engine light as well as re-learn your driving style with the transmission shift points.

 

Go on Amazon.com and buy a code reader. Some have libraries explaining how to fix issues and things to look for. If the codes won't clear and you own the car and machine, you can clear all the codes. Then, by removing the codes, you can drive it. However, if you do make note of the code(s) and keep those in the glovebox because the error code may come up again. If it does, THEN, check on what you had done and see what is left. IF the OEM Senso O2 Sensor was not replaced and you have the same code occur, then REPLACE that sensor.
KEEP ALL YOUR RECEIPTS because if you do have issues within a short time, depending on the warranty where you bought the part -- always ask what the warranty is. It may be 30 days up to 1 year or longer. Depending on the item and where you buy it at.
If you cannot do the work yourself, talk to the dealer and ask what they charge or your local mechanic.
Good Luck.

 

Probably everything is ok as the Stanley Cup finals just began yesterday...

 

It would have been nice if the OP had posted the resolution to his problem. It certainly sounded significant enough...