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20/10/2021 9:31 am
Topic starter
Scotty I have a 2000 F150 7700 4x4 5.4 2V that states that I have O2 sensor heater bank on all 4 O2 sensors.. Please your thoughts on this..
Thanks
Joseph
1 Answer
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20/10/2021 11:02 am
If you're having O2 sensor heater circuit codes on all 4 O2 sensors then pop the cover on the underhood fuse box and check if the fuse labeled "HEGO" has fried.
The power to all 4 of the O2 sensors' heaters is protected by that single fuse and if there's damaged insulation on the wire of just 1 of the O2 sensor's and it shorts to ground it will fry that fuse and cut off power to all 4 O2 sensor heaters and you'll get codes being thrown on all 4 of the O2 sensors' heater circuits.
