Hi, first post at this site. We have an F-150 Lariat 2005, that after a transmission job, blew fuse #32 (30 Amps) which is assigned to the AC compressor, and as the technician said, is related to the O2 sensor. The engine is shaking in idle and difficult to drive. The fuse if replaced, will blew again.

Tecs here in Puerto Rico are unable to find the electrical "short circuit". Any ideas of where to start with this problem? Please reply, thank you. Darrel

 

F32 is supposed to be a 15A fuse, not a 30A.

Double-check the actual number of the fuse that is blowing and make sure of its number. F33 is a far more likely candidate as it supplies the transmission and the two downstream sensor heaters.

F32 supplies about thirteen different things under the hood including the upstream sensors.

Inspect wiring harnesses for all the O2 sensors and make sure one didn't get left on an exhaust manifold or the like.