Just had bunch of work done.  Water pump, thermo, front Motor mount, plugs and tubes.  
Check engine light on when I picked it up.  Mech said to drive a bit then put some more antifreeze in.  I burped it and put another1.5 gallons in.  Thinking this would get florid of blinking temp light and code.  
Code remained so I checked it.
0341 and 1397 camshaft sensor codes.
I reset them and keeping fingers crossed.
Any thoughts?