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o2 DTCs

Discussion in 'Technical Chat' started by Doorslammers, Feb 14, 2009.

  1. Doorslammers

    Doorslammers [OP] New Member

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    Hey guys
    Ive got a 96, 3.4, 4x4 here with some troubles.
    I seem to be getting three codes
    PO125- Isufficiant temp for closed loop
    PO133- Signal slow B1-S1
    PO135- Heater circuit B1-S1

    Now, the voltage to the sensor is within the perameters in all driving conditions, the fuel trim seems to be reacting ok, and it seems to have no trouble getting into Closed loop, but the sensor does not cycle between rich and lean. In most driving conditions it will be at 0/s but the odd time it will hover around 0.5/s and sometimes (usually while coming to a stop) it will spike to 16.xx/s.

    Both sensors have been replaced with Bosch units with no change, i still get the same three codes, have there been any issues with these in the past? Has anyone run into this problem before that can shed some light on it?

    Thanks
     
  2. TRD4x4858

    TRD4x4858 Taco Traitor!

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    Does the truck have an 02 sensor heater relay? Some car companies use them
     
  3. Doorslammers

    Doorslammers [OP] New Member

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    hmm, i dont know. i dont have any information telling me about any heater relays, i have been using Alldata and none of the tests have mentioned them.
     
  4. TRD4x4858

    TRD4x4858 Taco Traitor!

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    Hmm then maybe it doesnt, is the signal that the pcm is recieving the one your seeing? All wiring ok, good fuses?
     
  5. Doorslammers

    Doorslammers [OP] New Member

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    yes, i am reading the values right off the scanner, so they would be coming from the PCM. all the wires seem to be good as well.
     
  6. Doorslammers

    Doorslammers [OP] New Member

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