High consumption of Ford Explorer 1997

Good evening, to see if they can help me with my explorer 1997 engine 4.0 L. It began to increase its consumption of gasoline, taking its performance per 350 km tank to only 200 kms.
I brought her to an autozone scan and threw the codes P0133 and P0144. A place mechanic told me that I would only have to clean the IAC sensor, which is after the catalyst.
I am in Ciudad del Carmen, Campeche and it is difficult to find a good mechanic here.
I appreciate your orientation to forum partners.