Hey everyone, just wondering if you all know what the possibility of a short in the Oxygen sensor heater circuit would be or do? I was wondering because I got this F350 the other day and now the check engine light comes on ( It is a 2012 F350 Gas 5.4L I believe). I use the OBD II reader and it says there are four codes : P0135, P0141, P0155, P0161 all at once are failed. Would a blown fuse do this or do you think that maybe they all just happened to go? I mean the truck has 230K km on the odometer, but not that means everything.

I was looking at the owner's manual and didn't see any fuse labelled the Oxygen sensor heater circuit, so I was wondering if it went by a different name, or does it not exist?

 

The O2 heater circuit is usually powered when the key is turned on, by the PCM Power relay, through a fuse in the Central Junction box then to the oxygen heaters.
Usually a 20 amp fuse.
CJB usually located under hood engine compartment driver's side.

 

So then just pulling them out one by one until I find it I guess? Do you have any idea what the fuse would be labelled? I looked over this manual, but not seeing anything that just jumps out at me really. Thanks for the head start though!

 

I can give you a location number, but that won't be of much help without you knowing the particular number they gave to that fuse.
Removal and inspection is one way to do it. Another much easier way is to use a test lite to check the top of each fuse . There should be power on both sides of the fuse, if only one side, the fuse is open. You can check the entire fuse panel in less than a minute.
Some fuses won't have power until you turn the key on.Some won't have power until the accessory is turned on.
Just remember, one side yes , other side no, fuse is open (N/G)

 

AH thanks! Yes, great advice and good insight. Will start checking them out right away!!!

 

Your manual or under the fuse block cover might have a fuse block diagram. I would look there first to avoid possibly causing another issue while probing the fuses.

 

as mentioned 2 times brother, i have already looked at a fuse block diagram in the manual and do not know what it could be labelled as. That's why he was mentioning the other method of tracking the problem down. Thank you!

 

After all this time, you may have found the fuse but it should be labeled as either HEGO or HO2S (maybe #23 ?). If the fuse is shared by something else, you could try that item to see if it is inoperative too without having to probe anything.You would be fortunate if a new fuse fixes the problem.They blow for a reason. A shorted power wire to ground from it rubbing on something likely would be the reason a new fuse would blow again.
btw- you would have a 6.2L engine in that F350. I think that was the only gas engine available.

 

That's an awesome idea! I'm sorry I couldn't have gone out there and checked around last couple days were crazy. But you have a really good point. I'll look into this hopefully on Sunday morning, maybe will see if a wire is shorting from like you said, rubbing or something. I wanted to check the fuse because that would indicate short as you say, but who knows, maybe all 4 were somehow gone at once? Anyways, thanks for taking the time to respond and ill be looking into these HEGO or HO2S right away!

 

Myself, I wouldn't bet on a longshot that all four sensors have failed at the same time. You either lost power to them or your powertrain computer is not providing a ground to complete the heater circuit for your O2 sensors or open wiring/connections between the heaters and that powertrain processor..
Look at harnesses which may be laying on brackets, a/c lines, chassis etc. Fuses do not wear out and they blow for a reason. If a fuse fixes it, I would be prepaired for the fuse to eventually blow again in the near future.
BTW- I think you have a 6.2 engine in your F350. It is the only gas engine listed for your truck.