2000 Grand Marquis P0125 code...

hello..new to the post..love my 2000 gm...i recently got an error code of p0125 using my code reader..just wondering if i could get some more info on this code. I know what the code reader says the error code means but is it a thermostat or ? thanks in advance for any help.

im thinking your thermostat is stuck open. that code means your engine isnt warm enough to go into loop cycle which means you will get bad gas mileage. thermostat is cheap and easy to fix, i would start there. ask someone at autozone or similar parts store with analyzer to check to see if getting same code. good luck