O2 Sensor Missing / Wrong PCM Flash?
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O2 Sensor Missing / Wrong PCM Flash?
I have an odd one here. I recently purchased a 1996 F-150 4.9 I6 from my father in law. Since ive known him its always had the check engine light on. Checking the codes i get:
P0136 O2 Sensor Malfuntion B1S2
P0141 O2 Sensor Heater Curcuit B1S2
Doing some reading this is the O2 that cshould be pluged into the bung at the cats. Well theres nothing there. The bung is there but its not bored/tapped for anything and there are no wires/plugs to be found anywhere near the location. I also noticed a tag on the underside of the hood that states the PCM was reprogrammed to F6PF-12A650-AGA on 01/15/1999 to address a TSB (No TSB No. Given) The only thing i can think of is some nitwit might have flashed the PCM with the wrong firmware. The reason why im going throuh all of this is it gets TERRIBLE! gas mileage and if the flash is wrong im sure that could have somthing to do with it. So what do you think and how do i go about getting this thing flashed back to what its supposed to be?
Thanks
Dan Klenczar
P0136 O2 Sensor Malfuntion B1S2
P0141 O2 Sensor Heater Curcuit B1S2
Doing some reading this is the O2 that cshould be pluged into the bung at the cats. Well theres nothing there. The bung is there but its not bored/tapped for anything and there are no wires/plugs to be found anywhere near the location. I also noticed a tag on the underside of the hood that states the PCM was reprogrammed to F6PF-12A650-AGA on 01/15/1999 to address a TSB (No TSB No. Given) The only thing i can think of is some nitwit might have flashed the PCM with the wrong firmware. The reason why im going throuh all of this is it gets TERRIBLE! gas mileage and if the flash is wrong im sure that could have somthing to do with it. So what do you think and how do i go about getting this thing flashed back to what its supposed to be?
Thanks
Dan Klenczar
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From: Denver Metro Area, CO
Googling on F6PF-12A650-AGA brings up a lot of results that I'd be reading if I were you.
I would be looking at a wiring diagram to see from where the wire for the O2 sensor originates as I don't understand why that component is missing - perhaps somebody thought they knew better than the engineers at Ford (thinking along the lines of your re-flash theory).
I would be looking at a wiring diagram to see from where the wire for the O2 sensor originates as I don't understand why that component is missing - perhaps somebody thought they knew better than the engineers at Ford (thinking along the lines of your re-flash theory).
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Wish i had a wireing diagram to look at. Part of why i posted this here is that maybe someone out there has one and can point me in a direction. I either have to get the PCM flashed to a version of the engine that didnt have the 3rd O2 sensor or purchase the pigtail that goes to it, then drill and tap the bung on the y-pipe......fun stuff!
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I did look up the PCM number and all i could get were a list of upgrade patches for specific versions. Couldnt find anything about what the upgrades changed or the differences between AGA AKA AJA.
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Joined: Nov 2007
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From: Denver Metro Area, CO
The OEM wiring diagrams rock! I have one for my 1981.
I think you want this:
1996 Ford F150-450 Truck Wiring Diagram Manual | eBay
I think you want this:
1996 Ford F150-450 Truck Wiring Diagram Manual | eBay
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