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Catylytic Converter Problem?

Discussion in '1st Gen. Tacomas (1995-2004)' started by bconnell87, Oct 12, 2010.

  1. Oct 12, 2010 at 12:41 PM
    #1
    bconnell87

    bconnell87 [OP] New Member

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    Theodore, AL
    Vehicle:
    98 PreRunner TRD
    Hello,

    I have a '98 PreRunner with the 2.7L engine. I changed the thermostat recently to get my engine to warm more quickly (to help with driving to work on cold mornings). Everything seems to have worked fine except my CEL came on the next day. I took it to AutoZone to get the code and it said "P0420 Catayst System efficiency below threshold - bank 1". I reset it and it has come back on again. My question is: How could changing the thermostat effect the cat system and what should I do to solve the problem?

    Thanks for your help!
     
  2. Oct 12, 2010 at 12:45 PM
    #2
    tacoma92

    tacoma92 Black Hole Sun

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    Forrest
    Gulf Shores, Alabama
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    09 SR5 Toyota Tacoma
    Same code came up on mine today too :(
     
  3. Oct 12, 2010 at 12:56 PM
    #3
    Toyotacrawler

    Toyotacrawler She's got the jimmy legs

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    Mike
    Cusseta/Opelika AL
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    5100's set to 1.75" Wheelers 3 leaf progressive AAL & 5100's for the rear Konig Countersteer Offroads K&N Drop in WeatherTech's Bed Mat Blacked out Badges Rear leaf TSB
    I had an 01 2.7L Taco that had that same problem after I added a downey header and removed the first cat. I would say that you need a new cat. Check the first one in line down your exhaust. I'm not real sure that what you did with the thermostat effected the cat system but don't quote me on that. Maybe its just a coincidence.

    Edit* Welcome to TW!
     
  4. Oct 12, 2010 at 1:04 PM
    #4
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Beech Creek
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    5100's all on fours

    Could be coincidence or this:

     
  5. Oct 12, 2010 at 1:42 PM
    #5
    bconnell87

    bconnell87 [OP] New Member

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    Theodore, AL
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    98 PreRunner TRD
    Thanks for the reply.

    I guess it could be a coincidence, but I was thinking that the change in engine temp might have some how effected the O2 sensors. Do you think I should try changing the sensors first?
     
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