My check engine light came on so I ran the scanner through and got P0141 which is a 02 sensor heater circuit malfunction(bank 1, sensor 2) Which sensor would be bad? I noticed one sensor in each exhaust manifold and then one in the cat.

 

Passenger side cat sensor. Have you searched the forum for that particular code? Good luck!

https://www.ford-trucks.com/forums/5...ml#post4353707

 

FYI...The 2 upstream sensors(Exhaust manifold) tell the computer what to do,the downstream ones merely check the converter operation,and "advise" if one of the cats are beyond operational thresholds.....

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