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CEL 2ndary 02 pls help!

Discussion in 'General Tech and Maintenance' started by r1paniccia, Oct 5, 2011.

  1. r1paniccia

    r1paniccia New Member

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    ok so i bought a 96 ek b16a2 swap p72ecu. car has a cel on for secondary 02 sensor. the primary is still hooked up, but there is no 2ndary hooked up, how do i hook this up ? do i have to tap into the ecu wires? there is a bung on the exhaust for a 2nd one just no were to plug it in! i really wanna get the cel off so i can pass inspection befor i turbo it. new york state is a pain in the butt with this! btw the prev owner gave me a 4 wire 02 sensor i just dont know where or what to do with it! any help is appreciated guys im clueless with this. i have searched and searched and cant come up with anything!
     
  2. r1paniccia

    r1paniccia New Member

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    cmon i cant be the only one thats had this issue :confused:
     
  3. CAFROG

    CAFROG Honda Minion VIP

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    Technically, you should have wires that have a plug on the end to accept the secondary O2.
     
  4. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    :concur:

    its an OBD2 car, there is a plug under there for the secondary O2
    get under there and look around
     
  5. r1paniccia

    r1paniccia New Member

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    there is no wiring under there for the secondary 02. there is a primary 02 hooked up on the cat but there is NOT one after it this is what i need. just need to know how to wire it in
     
  6. CAFROG

    CAFROG Honda Minion VIP

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    What wire harness do you have? If its off the EK......it has wiring for the secondary O2. But I don't know the history of your car. The secondary O2 wiring just may be cut somewhere. But maybe you got lucky and its tucked away in near the firewall or maybe under the carpet near the ECU?
     
  7. r1paniccia

    r1paniccia New Member

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    the previous owner said he used a 96-98 ex harness i beleave? he said it made the swap easier?
     
  8. CAFROG

    CAFROG Honda Minion VIP

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    That harness definitetly has 2 O2 sensor plugs. But if he ran a OBD1 ECU with a jumper harness (lke a chipped P06 or P28) then the O2 wiriing may have been cut or tucked away b/c it is not needed with a OBD1 ECU
     
  9. r1paniccia

    r1paniccia New Member

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    car currently has a p72 ecu (obd2) i beleave it was never wired in as part of the swap
     
  10. CAFROG

    CAFROG Honda Minion VIP

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    Once again.......it is not about being "wired in" I am 100% positive that a 96-98 EX harness has two plugs for 2 O2 sensors (primary and secondary). This became standard when OBD2A came out in 1996. 96-98 EX is a one piece harness form the sensors on the motor/trans/exhaust all the way through the firewall and into cabin which leads into the ECU (OBD2 P72)

    So, once again, the only way that yours is not there is it was cut or it has been tucked away. Or the previous owner lied/didn't know and you have a non-OBD2 harness (like OBD1 or OBD0)
     
    Last edited: Oct 13, 2011
  11. luky1380

    luky1380 New Member

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    is second O2 sensor plug is inside the car under carpet ???? at list thats how its on my 2000 civic si
     
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