Another P0126 code Question
 

Hello,
Long time listener, first time caller. So Ive been getting a code for a thermostat condition low in my 06 Mazda 3 2.3. I had the ETC senor changed and everything worked fine for about two weeks; then the engine light came back on and its now showing the same fault code P0126. Now if the engine light had stay on after I switched out the ETC sensor a few weeks ago I would assume the problem was with the thermostat itself, but since the engine light went off for a few weeks I am a bit confused. Any suggestions? Thanks