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Don't kno what it could be

Discussion in '1st Gen. Tacomas (1995-2004)' started by tacoma92, Oct 11, 2010.

  1. Oct 11, 2010 at 9:22 PM
    #1
    tacoma92

    tacoma92 [OP] Black Hole Sun

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    My check engine light came back on. I don't know wat it could be bc I just had my timing belt replaced and it was off for a bit and after I moved back onto a farm it came back on. Is it something to do w driving around the farm bc it has a few dip downs in the ground. Would tht have messed something up?:( Anybody know what this could be? :(
     
  2. Oct 11, 2010 at 9:31 PM
    #2
    tacosuprem

    tacosuprem Well-Known Member

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    Check the codes....
     
  3. Oct 11, 2010 at 9:39 PM
    #3
    tacoma92

    tacoma92 [OP] Black Hole Sun

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    Sorry I've heard of people doing that and I kno this makes me sound stupid but how do I check the codes exactly?:eek:
     
  4. Oct 11, 2010 at 9:43 PM
    #4
    JimBeam

    JimBeam BECAUSE INTERNETS!! Moderator

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    go to an auto zone or the like

    report back here with the codes they tell you
     
  5. Oct 11, 2010 at 9:44 PM
    #5
    JimBeam

    JimBeam BECAUSE INTERNETS!! Moderator

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  6. Oct 11, 2010 at 9:49 PM
    #6
    tacoma92

    tacoma92 [OP] Black Hole Sun

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  7. Oct 11, 2010 at 11:49 PM
    #7
    4WD

    4WD cRaZy oLdmAn

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    Grey wire MOD, deck plate, diff breather MOD, 2nd gen. OME 883# on Tundra 5100's, OMD custom 3" leafsprings, rear shock relocation, Ivan Stewart TRD rims w/285/75/16's, '02 bumper MOD, Famous Fabrications sliders , LED interior/exterior lights, bed bar, Custom tube bumper, Old school KC day lighters,Red Ring 8" HID flood, Kenwood vhf 2M.. umm some other shit I'm forgetting right now
    Yeah , AAMCO will scan for codes & explain for free also...
     
  8. Oct 12, 2010 at 10:34 AM
    #8
    tacosuprem

    tacosuprem Well-Known Member

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    never go to AAMCO. they are trash.
     
  9. Oct 12, 2010 at 11:34 AM
    #9
    tacoma92

    tacoma92 [OP] Black Hole Sun

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    Ok so I got it checked out and the code is P0420 which is saying Catalyst system efficiency below threshold (bank 1). So wat exactly does tht mean?
     
  10. Oct 12, 2010 at 11:42 AM
    #10
    08pretaco

    08pretaco Almost there

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    Cat might be clogged
     
  11. Oct 12, 2010 at 11:45 AM
    #11
    Janster

    Janster Old & Forgetful

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    Why don't you explain WHY...... because why would we believe you? :p;)
     
  12. Oct 12, 2010 at 11:47 AM
    #12
    Janster

    Janster Old & Forgetful

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    How many miles on your truck? Have you ever had the O2 sensor/s replaced?

    Try searching www.google.com and type in "P0420 toyota" and you'll see lots of information.
     
  13. Oct 12, 2010 at 12:10 PM
    #13
    tacoma92

    tacoma92 [OP] Black Hole Sun

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    274000 miles on it. I got the truck when it had 242000 on it and have never had O2 sensor replaced. Could tht be the problem? If so, is it crucial I replace it soon as possible?
     
  14. Oct 12, 2010 at 1:11 PM
    #14
    08pretaco

    08pretaco Almost there

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    If it is an 02 it is a problem because thats where the ecu gets its information on how the a/f ratio needs to be adjusted. With a bad sensor your sending a terrible signal constantly to the ecu and its always changing the ratio so you could be getting poor mileage and performance from your truck
     
  15. Oct 12, 2010 at 2:08 PM
    #15
    tacoma92

    tacoma92 [OP] Black Hole Sun

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    Its an 01. Does tht still apply to tht year?
     
  16. Oct 12, 2010 at 2:21 PM
    #16
    08pretaco

    08pretaco Almost there

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    http://mr2.com/TEXT/O2_Sensor.html

    that might give some insite as to how they work and if they are important

    easiest thing to do would probably be testing the voltage that the sensor draws, if that proves to be bad then change out the sensor and hope that works. If the sensor is showing proper voltage then maybe something might be wrong with the wiring or you could have a clogged cat. From the codes description it kind of sounds like a o2 sensor after the cat otherwise if it was before idk if it would mention anything about cat system below threshold...

    Actually to see if this is a realy problem an easy way to show is by either having whoever read the code erase it or unplug your negative battery terminal for a while. That should reset the ECU and if there is a problem then the code should pull up again.
     
  17. Oct 12, 2010 at 2:23 PM
    #17
    Janster

    Janster Old & Forgetful

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    Wow....that's a lotta miles!! Nice job keepin' her running!! I'm pretty sure the previous owner changed the 02 sensors before. Mine went out at 74K miles on my 96. They're easy to change, as long as they're not rusted/seized up to the threaded ports on the exhaust.
    For what its worth, this is my writeup of an 02 sensor replacement on 3.4 Manual.
    http://www.lieblweb.com/o2replacement.html

    Wouldn't hurt to get a different shop (free?) check the codes and see if they can narrow down the exact problem before changing the O2 sensors. You could change them anyway if you want..... just don't have to if that's not the problem.
     
  18. Oct 12, 2010 at 2:25 PM
    #18
    tacosuprem

    tacosuprem Well-Known Member

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    My brother worked at one part time when he was in the Navy for a few weeks. They will lie to you and change parts out when in fact they are good. They ripped off many many people. He left that place quick.
     
  19. Oct 12, 2010 at 2:26 PM
    #19
    08pretaco

    08pretaco Almost there

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    sounds kinda like jiffy lube and the whole conspirecy with that
     
  20. Oct 12, 2010 at 3:56 PM
    #20
    tacoma92

    tacoma92 [OP] Black Hole Sun

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    Well guys, the engine check light went off when I stopped at a red light /: in a way I'm glad it did but in another way I wanted to kno what the deal was. My truck jus seems bipolar about tht light. Is there still a prob there or do y'all think it jus happened to go away?
     
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