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Strange P0135 P0155 And I Need Help

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Old 07-14-2018, 12:04 AM
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Default Strange P0135 P0155 And I Need Help

Just purchased a 2007 F150 crew cab 5.5 bed 4x4 with a 4.6 triton 210k miles thatís been well maintained. Recently had intake replaced, induction module replaced, 2 COP replaced in last 6 months, evap module replaced, and tank pressure sensor replaced. All the codes were gone after those repairs Iíve been told. Before purchasing the vehicle I scanned it and it showed 3 codes, P0308 misfire on cylinder 8 and P0135, P0155. I replaced the COP #8 and that code cleared out leaving the 2 other codes. I replaced all 4 02 sensors with Bosch direct replacement. Cleared the codes and they came back. Iíve checked all the wiring and can find no problems. There is 12 volts present at both upstream heaters. Both heaters are heating up. You can feel them heating with your hand and see them with a flir thermal scope. Iím getting varying voltage feedback from all 4 sensors between .1 and .9 volts. Iíve reset the KAM. Iíve unplugged every sensor on the same circuit with the 02 sensors and tried to clear the codes. I get the P0135,P0155 codes along with whatever other sensor I have unplugged. The only thing I can see missing is there is no amperage draw showing on my snap on edge scanner for the 4 heaters but Iíve been told the pcm probably doesnít support that.
Iím stumped and everybody I know is somewhat stumped on this one.
Anyone run into something like this before ?
The truck runs fine besides a slightly rough idle and seems to get less than expected gas mileage on the first 1/3 tank.
Its not going into closed loop and Iím concerned about damaging the cats if this is left unsolved.
Any help would be greatly appreciated
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Old 07-14-2018, 04:57 AM
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Default temp sensor drivers head

Since I don't know the theory of operation of heater of o2 I'm guessing . The 12vdc is standing on o2 heater but pcm controls ground side . Engine temp into Pcm from left head drivers side may control pcm logic to bring on heaters . Thats my best guess .
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Old 07-14-2018, 07:28 AM
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There is a head temp sensor that is on a common feedback splice return wire to the pcm along with several other sensors, which are all of the sensors I unplugged to see if one of them could be the problem. The heaters are all turning on as soon as the ignition is turned on, you can feel them physically heating up as soon as the key is turned on and they are all showing on via my snap on solus edge scanner watching the pcm. If the codes are cleared they will return approx 5 seconds after the truck is started or if they are cleared while it is running they will return approx 5 seconds later.
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Old 07-14-2018, 01:35 PM
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Default I misunderstood problem -I re -read it .

I thought they were not heating up , I under stand pcm tests this circuit for flow if negative pcm side going to ground without using pcm driver then it will sense no flow on heater . Unplug pcm with engine off to see if circuit going to ground at o2 sensor plug with meter of course, I have heard of these wires being pinched to ground . . I know I'm not helping much , trying to learn with you .
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Old 07-14-2018, 03:14 PM
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I went and purchased a new OEM ford O2 sensor and put it on the drivers side. Cleared the codes and started the truck. Approximately 5 seconds later I had both P0135 & P0155. I cleared the codes with the truck running and approximately 5 seconds later both codes were back. Exactly the same results as I had with both sides having the Bosch sensors. I could feel the ford OEM heating up hot, and it showed white hot on a flir thermal scope up in the O2 sensor. The sensors are heating up.
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