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P0412 code

Discussion in '1st Gen Tundras (2000-2006)' started by Baller, Feb 15, 2019.

  1. Feb 15, 2019 at 6:32 PM
    #1
    Baller

    Baller [OP] New Member

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    Truck just starting throwing a P0412 code. I’ve tried to clear it and the second I do, it comes back. What and where to check first?
     
  2. Feb 15, 2019 at 6:36 PM
    #2
    Casper421

    Casper421 Adventure in a 1st gen

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    This kit or similar.
     
  3. Feb 15, 2019 at 8:30 PM
    #3
    Baller

    Baller [OP] New Member

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    Just watched this. What a PITA it is taking off the intake plenum. I'm new to Toyotas but, doing the same on my 3.0L Honda is 1/3 the job. So it's Ok to run without the secondary air injection system?

     
  4. Feb 16, 2019 at 1:03 AM
    #4
    stevechumo

    stevechumo New Member

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    The CEL will come back no matter how you clear it, because it's malfunctioned. Taking the plenum off is not a PITA, but replacing the smog valves on the back near the firewall is a real problem. Lol.
     
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  5. Feb 16, 2019 at 3:42 PM
    #5
    Baller

    Baller [OP] New Member

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    Will fixing the P0412 require replacing the smog valves?
     
  6. Feb 17, 2019 at 12:33 AM
    #6
    stevechumo

    stevechumo New Member

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    It's not necessarily. The P0412 seems like a famous failed air injection pump. Since you take out the air intake plenum, it's a chance to replace or at least double-checking, then cleaning up all related components at once. If 1 of them fail, it's a PITA to redo everything. On my truck, I even replaced the starter even it's still good. The factory smog valves are hard to fail, because they're just generated by the vacuum that opens the valve inside. I bought 2 new Japan smog valves, but ending up using 1 new and 1 old. 1 new one failed. I think both old ones are still good. I removed the old ones, soaked them in Sea Foam overnight, then scrubbed off the carbon. After cleaning, I hooked them to a vacuum line in a car to check for function. They all worked fine.
    For the air pump, I use the Dorman 306-010 Electric Pump on Amazon for $123. I found out it's made for various American cars, but the core is exactly the same for Tundra and other Toyota models. I think Dorman is American company. I kept the factory pump shell, and replaced with the Dorman motor inside. It's working well for over 4 months now. Don't use unknown cheap China air pumps. I used 2 previous ones, and they only lasted for 2-4 weeks.
     
  7. Feb 17, 2019 at 5:58 AM
    #7
    growit

    growit New Member

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    I have 2006 dbc, used the bypass kit several years ago, it's a easy install and work's great.
     
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  8. Feb 17, 2019 at 8:53 AM
    #8
    Filthyphil

    Filthyphil New Member

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    Bingo
     
  9. Feb 18, 2019 at 8:35 AM
    #9
    Baller

    Baller [OP] New Member

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    Sounds like we need a discussion on which system is the best. Which is it? The Hewitt system is quite a bit more expensive than the Rutech kit but, it does come with the ignition wire. I'm not sure one wire is worth it, though. What do people think?

    Here's what I've seen out there so far. Are there any others I should be looking at?

    Hewitt
    https://hewitt-tech.com/store/index.php?l=product_detail&p=12

    Rutech
    https://rutechsolutions.com/products/aip47?variant=38455630340

    Random Ebay kit
    https://www.ebay.com/itm/Toyota-4-7...-NO-CUTTING-/162582156626?hash=item25daa6d552
     
    Last edited: Feb 18, 2019
  10. Feb 18, 2019 at 1:53 PM
    #10
    Baller

    Baller [OP] New Member

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    Anyone out there?
     
  11. Feb 18, 2019 at 3:00 PM
    #11
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Heller???

    I’d chime in, but think this is a later 1st Gen Problem? The earlier models without vvti do not suffer this?
     
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  12. Feb 18, 2019 at 3:36 PM
    #12
    Filthyphil

    Filthyphil New Member

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    Same, I would probably go with Hewitt but I would be interested to hear from someone who actually has one of the kits on their truck.
     
  13. Feb 18, 2019 at 4:07 PM
    #13
    growit

    growit New Member

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    I used the Hewitt kit, it's been several years with no problems. Give them a call and tell them what codes you have and they will tell you what kit you need.
     
  14. Feb 18, 2019 at 4:08 PM
    #14
    Baller

    Baller [OP] New Member

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    If you can't tell, I'm having a hard time with this one. I'm trying to find a justifiable reason the Hewitt unit is $80 (44%) more than the Ru unit. I'm not sure I ever turn the ignition on for more than a couple of seconds without starting the engine.
     
  15. Feb 18, 2019 at 6:03 PM
    #15
    simonmiles

    simonmiles New Member

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    I never had the CEL code pop up on my 2006 DC but I did have the vacuum sound associated with the SAIP upon starting the engine. I read that this would eventually lead to a CEL and possible limp mode so I installed the Hewitt bypass kit. Whether it's worth the extra money I can't say. I did like having the starter relay wire that is not available with the Rutech bypass kit. I figured if I was going to do this one time I'd rather spend a little more and get the one with the extra feature. It's been working great and I haven't had any issues. I didn't even install the block-off plates since I never ran into a CEL code. Hope this helps.
     
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  16. Feb 19, 2019 at 9:24 AM
    #16
    Baller

    Baller [OP] New Member

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    :thumbsup:
     
  17. Feb 19, 2019 at 1:05 PM
    #17
    Baller

    Baller [OP] New Member

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    Here's some advice that was good to follow. Just called them and for a P0412 you have to buy the SAIS bypass kit as well as their Valve Solenoid Pack. I wouldn't have been real happy if I would have bought the SAIS kit and it didn't completely fix my problem. Ordering the goods now.
     
  18. Feb 19, 2019 at 1:19 PM
    #18
    Sas

    Sas Humor is everywhere

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    Lost track after #1.
    Your wallet. On the counter.
     
  19. Feb 19, 2019 at 2:05 PM
    #19
    Baller

    Baller [OP] New Member

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    No kidding. These kinds of fixes aren't fun. Truck doesn't sound better, doesn't look better, isn't more capable and doesn't go any faster. I'm paying to make a system the truck didn't even need to have in the first place, inoperable. What a downer.
     
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  20. Feb 19, 2019 at 2:13 PM
    #20
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Whoa!
     
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  21. Apr 9, 2019 at 8:35 AM
    #21
    Corydel2747

    Corydel2747 New Member

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    None
    I can speak from experience I bought the rutech kit and had Mass air flow sensor codes throwing all the time. I took the kit off and they never came back. Rutech explained that if your computer was updated at the dealer which mine was then their kit doesn't jive well with the ECU and will throw xodes so I sent it back. Talked to Paul Hewitt and he knows his product well. I cannot say for sure but I think rutech is a cheap attempt at a copy of hewitts without knowing anything about the product or putting any engineering into it. From what a gather he puts alot of time and money into research and development of his kits and he walked me through my rutech kit which wasn't even his and he didn't have to do that. For that I believe it's worth the extra cost. His customer service and knowledge is excellent!
     
  22. Apr 29, 2019 at 11:05 AM
    #22
    Glenn200269

    Glenn200269 New Member

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    I am thinking about buying the huwitt bypass kit. Code p0412 is up. If I install this kit can I still pass yearly Texas inspection?
    I’m worried about the computer diagnostic test mostly.
     
  23. Apr 29, 2019 at 6:21 PM
    #23
    Baller

    Baller [OP] New Member

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    Give them a call. They're remarkable knowledgeable and helpful. I'm confident they'll be able to answer any question you have sufficiently.
     
  24. Apr 29, 2019 at 7:48 PM
    #24
    Glenn200269

    Glenn200269 New Member

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    I will do that. Thanks!
     
  25. Apr 30, 2019 at 1:57 PM
    #25
    simonmiles

    simonmiles New Member

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    I installed the Hewitt-tech bypass kit on my 2006 Tundra. I live in Texas in a county where they check for emmissions (smog) and attach an OBD-II scanner. Mine recently passed less than 6 months ago. Hope this helps.
     
  26. Apr 30, 2019 at 5:20 PM
    #26
    Glenn200269

    Glenn200269 New Member

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    That helps a lot! Thank you simonmiles
     

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