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P0401

Discussion in '1st Gen. Tacomas (1995-2004)' started by sramirez1516, Aug 1, 2020.

  1. Aug 1, 2020 at 8:34 PM
    #1
    sramirez1516

    sramirez1516 [OP] Saul R.

    Joined:
    Jan 23, 2017
    Member:
    #208449
    Messages:
    198
    Gender:
    Male
    First Name:
    Saul
    Vehicle:
    2002 Toyota tacoma xtracab prerunner 2.7
    None
    I been getting this code on and off since I got the truck 3 years ago but it wasn't until recently that we started hauling a boat and I've noticed the code goes away whenever the O/D Off light is on.

    Tried everything and even replaced the EGR valve and did a whole bunch of troubleshooting. Could there be a connection between high rpms and the P0401?
     
  2. Aug 1, 2020 at 8:52 PM
    #2
    0xDEADBEEF

    0xDEADBEEF This statement is false.

    Joined:
    Mar 2, 2019
    Member:
    #285037
    Messages:
    4,518
    Vehicle:
    2000 4WD MT Single Cab
    Rust, dents, miles.
    So I had a P0402 code recently, which is the opposite of an P0401, but I think they have similar origins. Mine turned out to be clogged vacuum ports in the throttle body.

    High rpms is a low vacuum situation if i remember right, so if something is clogged that could cause an issue.

    I ended up trying to blow through all the different tubes connected to the throttle body and found a couple that were nearly impossible. A quick pressurization from the air compressor took care of that.

    Also, what condition are your vacuum lines in? A leak could be a problem too.


    Lastly - have you tested the EGR temperature sensor? If its not working right you can get codes from it (in fact its a pretty common cause)
     
    Black DOG Lila and cruiserguy like this.
  3. Aug 3, 2020 at 11:53 AM
    #3
    sramirez1516

    sramirez1516 [OP] Saul R.

    Joined:
    Jan 23, 2017
    Member:
    #208449
    Messages:
    198
    Gender:
    Male
    First Name:
    Saul
    Vehicle:
    2002 Toyota tacoma xtracab prerunner 2.7
    None
    I checked all the vacuum lines and even replaced a few that looked old.

    I'm starting to wonder about the temp sensor.
    I'm going to check.

    What's interesting is that if I haul my boat for about 45 mins the light CEL stays off for a while, I drive this truck almost everyday with the exception of weekends and it does stay clear but after a few days, sometimes weeks, the CEL comes back.

    Thanks for your input.
     

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