So I have been trying to clear my monitors for emissions for 2k miles. This truck has passed emissions for 9 years fine. The O2 and HTR monitor won't clear. I have learned a ton and now I have another thing I just got told.

I am told the HTR line of the O2 sensors have a FUSE in the engine compartment. I am told the reason the O2 won't clear is the HTR must work run first. I replaced both of my pre cat O2's even though they seemed fine since I have 140k on my truck so I know the O2 Sensors are good. So now I am being told to replace the HTR Fuse and it's in the engine bay. Well silly me I thought "well that will be easy to find in the fuse box" guess again. I can't find a single indication which fuse it is no manual indicates which fuse, google is not helping either. So who here can help with the fuse number?

I have a 2015 Ford F150 XLT 4x4 with the 5.0.

TIA

 

I think its Fuse 95 but what else is on the circuit?

 

What is/are the codes?
We/you need to be accurate about the actual cause of the emission failure.
There is no specific dedicated fuse listed in either fuse block.
There are 4 Ox Sensors, we need to know about, first, not on someone elses say so, because he did not give you enough info.
In some systems the heater power is temperature controlled by pulse width application. That type control will be from a Module making the problem a bit more complex than just a fuse.
Was the heater power measured and found to be missing etc?
What Sensor and Bank is Power missing etc.
Good luck.

 

Thank you for the response.

No codes, the monitors for O2 and HTR do not clear. In GA with emissions you can only have 1 monitor not cleared. They have not cleared after 2k and 20+ Drive Cycles. I am able to clear all but those 2 on my drive cycles. Heaters are only on the pre Cat O2's (so I am told). The original O2 sensors were fine just old but I opted to replace the 2 pre CAT to be safe. This is the Drive Cycle I have been using:

Ford Drive Cycle

Much to my dismay fuse 95 is good. The only other suggestion I have left is to replace the battery. I have been told 3 times it is great (it's a year old). Here my list of what I have tried:

2k miles
20+ Drive Cycles
Replaced both pre CAT O2 sensors told Htr's are only in pre CAT otherwise I would have done all 4.
Cleaned the Throttle Body
Replaced the Purge Valve (since they are so dang problematic)
Reset PCM by disconnecting battery negative and jumping to positive for 30 minutes 3 times.
Reset all the Monitors (8 or 9) and Drive Cycled to clear all but O2 and HTR

There are No Active Codes no Pending Codes truck seems to run fine same milage etc. The only other issue with the truck is 2 bad TPMS's and those get replaced next week but Ford says no connection. I am the original owner from 2014 never been an issue to pass emissions, no custom tune unless ford put one in there. All this for my GA Emission. I am open to any ideas.

 

If the self-diagnostics don't clear for those tests, either the drive cycle is not long enough or there is an issue.
Trying to use a prescribed drive cycle does not always work as well as you expect it to.
If the heaters are in fault, there will be a code because the PCM monitors those circuit for opens, crosses and grounds.
Those codes, depending on which Senors, are from P 0131 to P 0161 code range.
If the Ox Sensors cannot report their Ox Sense signals to the PCM, there are other codes to indicate that.
They are in the p0171 to 179 range.
Look them up to see the associations using the correct code list for Ford.
No codes with a normal self diagnostic failure indicates something else is going on.
The best way now is to put a Sanner on the system and look at the Sensor live operations to get the clue to what is going on.
This is a case where just looking at the Pids tests won't give you that clue, if they don't clear.
You have to go deeper into diagnostics to find any cause.
Be sure to re-check your work for some error.
There cannot be an issue in Diagnostics without it being detected except for conditions and time the system needs, to complete them.
When all PIDS pass, all indicators will be off and no code P1000 will be set.
Good luck.