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Check engine codes

Discussion in '1st Gen. Tacomas (1995-2004)' started by OH-MAN, Dec 29, 2009.

  1. Dec 29, 2009 at 9:06 AM
    #1
    OH-MAN

    OH-MAN [OP] Well-Known Member

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    I am working on my son's 02 prerunner and I noticed his check engine light is on.
    I will run up to the local parts store and get the guys to scan it.
    Does anyone have a list of the codes so when they pull it I can see what it is?

    Thanks in advance.
     
  2. Dec 29, 2009 at 9:14 AM
    #2
    humanoid

    humanoid bite me

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  3. Dec 29, 2009 at 1:25 PM
    #3
    OH-MAN

    OH-MAN [OP] Well-Known Member

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    I removed the neg. batt. post to see if it cleared and so far no light back on.
    We will see if it returns.
    Thanks for the quick and very informative info.
    I appreciate it.!!
     
  4. Dec 29, 2009 at 4:17 PM
    #4
    humanoid

    humanoid bite me

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    You may have cleared the light, but the trouble code may still be stored in the computer. Get the code(s) read and find out what's causing the CEL.
     
  5. Dec 30, 2009 at 7:05 AM
    #5
    OH-MAN

    OH-MAN [OP] Well-Known Member

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    Will do!
    Thanks again for the great info.
     
  6. Dec 31, 2009 at 5:19 PM
    #6
    kevhogaz

    kevhogaz Low Speed, High Drag

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    I'll tag this to see if the light comes back on. I have access to all the codes, and flow charts for diagnosis.
     
  7. Jan 1, 2010 at 9:20 AM
    #7
    Hambone155

    Hambone155 Well-Known Member

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    port and polish intake manifold, supercharger, pulley for charger, lifted, tires, deckplate, (doing full engine build)
    they run codes for free????? orileys, napa, advanced. wheres the place to go?
     
  8. Jan 14, 2010 at 5:31 PM
    #8
    OH-MAN

    OH-MAN [OP] Well-Known Member

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    Gentlemen,
    You were correct. The check engine light did come back.
    P0420 The place that read it say's it is "Cat system efficency below threshold (bank1)

    About a year ago he had the rear cat hacked by thieves out and we had a muffler shop replace it ( not with a Toyota ).
    Is it possible it is the front cat on bank one?
    I am new to these engines which side is bank one?

    Or is it most likely the back cat that was replaced.
    Truck has apx 91K on it for miles.

    Is it likely the sensor is not working correctly?
    Does that happen very often?
     
  9. Jan 14, 2010 at 5:40 PM
    #9
    ETaco23

    ETaco23 Marshall offroad Fabrication

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    Usually its the sensors... I just had the same code, and figured out that cat's were still good, and then changed both sensor's and now all is good! :)
    I would start with the sensor's. But with this code it can only be 2 things, cat's and sensor's. Usually...
     
  10. Jan 15, 2010 at 7:28 PM
    #10
    OH-MAN

    OH-MAN [OP] Well-Known Member

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    My son has the truck now, is there 3 sensors total? or just 2?
    Would you happen to know the part numbers so I can pick them up and do the truck without tieing it up for too long.
    Thanks again.
     
  11. Jan 15, 2010 at 8:17 PM
    #11
    humanoid

    humanoid bite me

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    Don't you want to make sure it's the sensor s that are giving you the problem before you change them out? BTW, there should be 2 of them, one before and one after the catalytic converter.
     
  12. Jan 15, 2010 at 10:32 PM
    #12
    ETaco23

    ETaco23 Marshall offroad Fabrication

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    There are 2... ^^ Yeah, do check and see it is indeed the sensors. Usually you can just tell by looking at them. Like mine were very black, and had burnt spots on them. (Indicating bad)
    Usually o2 sensors should be replaced around 80-100k miles bc they are a wear item, and your mpg's and trucks performance will suffer.

    Or you can have a shop check them out.
     
  13. Jan 16, 2010 at 5:36 AM
    #13
    OH-MAN

    OH-MAN [OP] Well-Known Member

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    Thanks guys I will pull them out as it is 90K miles and see if they ar messed up.
    Much appreciated.
     
  14. Jan 16, 2010 at 6:39 AM
    #14
    kingston73

    kingston73 Well-Known Member

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    Like others said, don't go replace sensors just yet. The factory shop manual says check for 1) exhaust leaks first 2) sensors 3) cat

    I had this code not long ago, and in checking things found a big exhaust leak just after the cat. Fixed the leak and turned off the CEL, and it hasn't come back yet. Total cost - $0. Not saying that's what it is, but eliminate that first before buying any parts.
     
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