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K&N Box filter + Deck plate mod = bad O2 sensor

Discussion in '1st Gen. Tacomas (1995-2004)' started by StAndrew, Jul 12, 2010.

  1. Jul 12, 2010 at 6:11 AM
    #1
    StAndrew

    StAndrew [OP] Wait for it...

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    Chris
    Hampton Roads, Va
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    Deck Plate Mod; Grey Wire Mod; 1.5" AAL; 1.75" Lift Shackles; Bilstein 5100's; Eiback Coils; LR UCA; Front Diff Drop; Tundra Brake Upgrade; Wheels Offroad Brake Lines; Rear Diff Breather Mod
    I just finnished my deck plate mod about two weeks ago. Within those two weeks I had 3 check engine lights, all of them O2 sensor. Each time I pull it out, the front side is caked with black soot.

    My theory is the increased air flow is blowing the oil off the K&N filter. That mixed with smog is caking up my sensor. I say smog because all three times, the light came on in a tunnel during rush hour (If you're from Hampton Roads, VA, you know exactly what I mean).
     
  2. Jul 12, 2010 at 6:16 AM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Your increased air flow may be causing it to run a hair on the rich side. The only way to truely test your theory is to switch to a dry drop in filter and see what happens. I doubt it is the oil on the K&N. I would also suggest cleaning the MAF too.
     
  3. Jul 12, 2010 at 6:32 AM
    #3
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    FlimFlubberJAM
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    Could be the O2 was on its way out. Cleaning them doesnt work, you need to replace it.
     
  4. Jul 12, 2010 at 6:32 AM
    #4
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    And its normal for them to have soot on it.
     
  5. Jul 12, 2010 at 6:48 AM
    #5
    maconhurler

    maconhurler Well-Known Member

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    FWIW, I'm running the K&N filter with the deckplate mod and have had no problems with this. I do not drive in high smog areas such as the tunnel. The air here in Harrisonburg is rather nice.
     
  6. Jul 12, 2010 at 3:18 PM
    #6
    crazyasu45

    crazyasu45 Well-Known Member

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    Did u reoil your K&N filter yourself? or is it brand new?
     
  7. Jul 13, 2010 at 9:30 AM
    #7
    StAndrew

    StAndrew [OP] Wait for it...

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    Its new (the Filter). I cleaned the sensor and it was doing just fine, then I hit the tunnel and it goes. Its got ~100k on it, so I guess its about time to replace.

    When is it recomended you replace your sensor?
     
  8. Jul 13, 2010 at 9:33 AM
    #8
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    When they go bad. They don't have a regular service interval. Sometimes they won't even throw a code either. Make sure you get a Denso OEM sensor and not a universal.
     
  9. Jul 13, 2010 at 10:42 AM
    #9
    StAndrew

    StAndrew [OP] Wait for it...

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    Im retarded. Its the Mass Air Flow sensor that keeps going bad... Not the O2.
     
  10. Jul 13, 2010 at 10:42 AM
    #10
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    What code are you getting?
     
  11. Jul 13, 2010 at 10:47 AM
    #11
    StAndrew

    StAndrew [OP] Wait for it...

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    Dont remember the exact code. There were three, to include the MAF and I think O2. The mechanic said a bad MAF would pop all three. I cleaned it off and reinstalled and it was fine (3 times in fact). Each time, I get a black sooting deposite on the sensor.
     
  12. Jul 14, 2010 at 6:55 PM
    #12
    sawyer'sdad

    sawyer'sdad Member

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    i got a check engine light 3 days after my deck plate mod, and it was the same thing. I cleaned the MAF and have not had any more trouble... It pulls the oil off the filter and raps up the elements on the MAF.
     
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