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The story & concerns regarding catalytic issue

Discussion in '1st Gen. Tacomas' started by prerunnerSD, May 15, 2012.

  1. prerunnerSD

    prerunnerSD [OP] "I Brake for Tailgaters"

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    Grill guard Front and rear Bilstein 5100's Front Coilovers Rear AAL "I Brake for Tailgaters" Firestone Destination A/T (P265/75/R16)
    Check engine light was on.. code determined to be: PO420, "Catalyst system efficiency below threshold Bank 1"


    [​IMG]

    Took truck into Firestone and after spending $100 for diagnostics which they said would be more in depth than my code checker they gave me an invoice for $2,500 saying a needed both 2 new sensors and 2 new catalytic converters.

    I'd like some advice on how to proceed?
    Should I purchase all the parts as they say and where? Are the part numbers on this invoice accurate?
    Are they just overcharging me and could it be as simple as changing one sensor??

    I've cleared the code and it stays off for a couple days but then comes right back on again so I know its not just a fluke.


    Here is a copy of the invoice they gave me.

    [​IMG]

    I'd like some advice on how to proceed?
    Should I purchase all the parts as they say and where? Are the part numbers on this invoice accurate?
    Are they just overcharging me and could it be as simple as changing one sensor??
    Anyone know a good place to get these parts or do one step better and get parts better than stock?
     
  2. dexterdog

    dexterdog My pee parts itch

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    I would switch out the O2 sensors first and clear the code. If the code comes back then I would look towards the cats.
     
  3. aportis72

    aportis72 Well-Known Member

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    I would almost guarantee its just the sensors. Look them up on rock auto they are cheap. replace them and if you throw a code after replacing them then get some O2 simulators and dont worry about it that is way to much money IMO
     
  4. jsmarine

    jsmarine Well-Known Member

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    Be sure to buy Denso sensors, thats what came OEM, and what works the best.
     
  5. prerunnerSD

    prerunnerSD [OP] "I Brake for Tailgaters"

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    both sensors right? where can i get denso sensors?
     
  6. prerunnerSD

    prerunnerSD [OP] "I Brake for Tailgaters"

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    went to rockauto and they have a lot available.. should i get both sensors or just upstream or downstream?
     
  7. jsmarine

    jsmarine Well-Known Member

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    I would replace both at the same time, but the upstream one for sure.

    edit: And check amazon for denso sensors.
     
  8. prerunnerSD

    prerunnerSD [OP] "I Brake for Tailgaters"

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    thanks, not to seem helpless but im on amazon.com looking for denso sensors and they have hundreds of them and no good way to input what kind of car you have to help indicate which sensors do you need.

    http://www.amazon.com/s/ref=sr_nr_scat_15735801_ln?rh=n%3A15735801%2Ck%3Adenso+sensors&keywords=denso+sensors&ie=UTF8&qid=1337107801&scn=15735801&h=348eda178390937a8703018c3aff62364f8e7fd6#/ref=sr_nr_p_4_0?rh=n%3A15684181%2Cn%3A%2115690151%2Cn%3A15719731%2Cn%3A15729591%2Cn%3A15729601%2Cn%3A15729701%2Cn%3A15735801%2Ck%3Adenso+sensors%2Cp_4%3ADenso&bbn=15735801&keywords=denso+sensors&ie=UTF8&qid=1337107819&rnid=49681011

    Heres a link to the listings on amazon... could you recommend the model numbers? I appreciate it.
     
  9. prerunnerSD

    prerunnerSD [OP] "I Brake for Tailgaters"

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  10. jsmarine

    jsmarine Well-Known Member

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  11. mbrogz3000

    mbrogz3000 Well-Known Member

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    You should also get the socket head for O2 sensors...it has a whole side cut out of it so the cable harness can stick out and not interfere. I allows the use of a socket wrench or breaker bar to remove instead of a some short open ended wrench that can slip off. Its a cheap tool when I looked one up.

    After replacing the sensors and if needed, you can try removing the Cat and dropping it in some heavy detergint cleaner, let to soak and try to clean the honeycomb. Once dry, re-install and see if the code stays away. or look into those O2 simulators

    Stupid emissions crap is all a racket...
     
  12. SnowroxKT

    SnowroxKT AK SnowroxKT

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    I second the o2 sensor wrench or "crow's foot" wrench.

    As to how to fix it, there are ways that won't pass emissions, do you have emission programs where you live? Or do you want it to be perfect? (if the sensors don't fix the issue)
     
  13. meatman

    meatman I deal with dead animals

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    He won't need a o2 sensor socket... both sensors are held in place with 2 12mm. nuts FWIW
     
  14. prerunnerSD

    prerunnerSD [OP] "I Brake for Tailgaters"

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    Thanks for all your help. ive added the OEM denso upstream 02 sensor and reset the code and hours later the same code came back on.. could this just be a fluke or is there something else wrong, could the sensor be bad?? original code was: "PO420, "Catalyst system efficiency below threshold Bank 1"

    what else code be wrong?
     
  15. goomba

    goomba It is a Fluid Situation

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    The up-stream sensor is for air-fuel mixture, the downstream sensors are for making sure the cat is working properly. 2 completely different sensors. If you get the wrong sensors you may get the P0125, P0133, P0130 codes < this is happening to me.
     
  16. prerunnerSD

    prerunnerSD [OP] "I Brake for Tailgaters"

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    hello thanks for your effort but i was not referring to the downstream sensor. i am getting a p420 bank 1 error and was told just to replace the upstream, sensor. i am not getting any of the codes you mentioned but thanks for your response anyway.

    hopefully someone else can help get to the bottom of this.
     
  17. goomba

    goomba It is a Fluid Situation

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    Ment to say sensors. But good luck.
     
  18. koco

    koco Well-Known Member

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    $57 for the rear sensor (Denso oem) with free shipping.

    Link
     
  19. toy.tech21

    toy.tech21 Active Member

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    The 3.4l engine is very well known for the p0420 cat code. Not much way around it but then to replace the cats. Its not the sensors and they wont fix the problem so i wouldnt waste your money. The price quote you got sounds about right. They are just expensive parts.
     
  20. koco

    koco Well-Known Member

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    I have seen p0420 fixed by replacing the rear sensor with an oem denso unit. If it gets clogged or wears out, it will cause the code. The catalytic was soaked in laundry detergent overnight though.
     
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