Im showing these codes. i just bought truck.1997 f150 4.6.does anyone know procedure on diagnosing 02 sensors.also does anyone know the location and number of heater circuit fuse.Everyone says to check fuse but no one can tell me where it is.any help would be very much apreiciated tks

 

The codes you posted are for the downstream O2 sensor bank 1. That sensor is after the converter for cyls1,2,3 &4.

 

tks but already know which sensor it is i just need to know where fuse is so i can check to see if that is why im not getting current