i have a 2011 ram 1500 laramie 4x4 with the 5.7 hemi my i used the auto start on tuesday to get the ac going and it turned itself off then when i started it with the key the check engine light was on. so i took it to a shop and it is showing that all 4 of my 02 sensor heater circuit or whatever is out on all 4 we don't think that all 4 would go out at once and I'm not sure what it could be anyone have any ideas or had this problem yourself?

 

i have a 2011 ram 1500 laramie 4x4 with the 5.7 hemi my i used the auto start on tuesday to get the ac going and it turned itself off then when i started it with the key the check engine light was on. so i took it to a shop and it is showing that all 4 of my 02 sensor heater circuit or whatever is out on all 4 we don't think that all 4 would go out at once and I'm not sure what it could be anyone have any ideas or had this problem yourself?

 

Check the fuse and relay that supplies power for the heater circuit. The odds of all four failing at once is well beyond plausible.

Welcome to DF!

 

That would indicate that the circuit that powers them has a blown fuse or loose/damaged wire

 

thanks i have not been able to identify which fuse or relay it is the pcm fuse is fine but i dont know what else to look for

 

thanks I've looked at the fuse box and i can't figure out which one is for the o2 sensors the pcm fuse is fine so idk what else to look for

 

May need to pick up a service manual, and check out wiring diagrams.