1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Should I Clear Fault Codes To Diagnose Potential Problem?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Mr. Farknocker, Apr 27, 2021.

  1. Apr 27, 2021 at 12:09 PM
    #1
    Mr. Farknocker

    Mr. Farknocker [OP] New Member

    Joined:
    Aug 23, 2010
    Member:
    #42115
    Messages:
    3
    Gender:
    Male
    I've owned my Taco since I bought it brand new in 11/04 and have logged over 146K miles on it. I've been fortunate with this truck and have not had any mechanical or electronic issues (other than the AM radio randomly changing stations on its own which somehow stopped a while back). The check engine light just went on for the first time in 16 years. Whatever triggered the light doesn't seem to affect the operation of the vehicle. My thought is that the ECU has probably logged in a lot of faults over the 16 years and some of those problems no longer exist. Should I clear all of the fault codes to start with a fresh slate and then operate the vehicle to determine whether there are any current problems that need to be addressed?
     
    Last edited: Apr 27, 2021
  2. Apr 27, 2021 at 12:14 PM
    #2
    Speedytech7

    Speedytech7 Toyota Cult Ombudsman

    Joined:
    Feb 20, 2014
    Member:
    #123587
    Messages:
    36,070
    Gender:
    Male
    First Name:
    Zane
    Spokane, WA
    Vehicle:
    93 Land Cruiser & 96 Tacoma V6 4WD
    I've done a mod or two
    They periodically dismiss codes on their own if the problem resolves, if you're seeing the light stay on it's time to scan the ecu and see what the code is. You can begin diagnosis now.
     
  3. Apr 27, 2021 at 12:18 PM
    #3
    nd4spdbh

    nd4spdbh Well-Known Member

    Joined:
    Oct 7, 2013
    Member:
    #114055
    Messages:
    11,487
    Gender:
    Male
    SoCal
    Vehicle:
    13 DCSB TRD OR v6 Auto
    if you havnt had a check engine light on, and now do, it will only show current faults/pending codes. Not all previous codes. Have the code read n go from there
     
  4. Apr 27, 2021 at 12:18 PM
    #4
    tirediron

    tirediron Well-Known Member

    Joined:
    Jan 19, 2019
    Member:
    #279864
    Messages:
    1,962
    First Name:
    John
    Vehicle:
    2018 4x4 Sport, Auto, BBP
    Best bet is to note down all the codes and their status (pending/historical/current), clear them and see what reoccurs. At that age/mileage, and with no other noticeable symptoms likely an 02/AF sensor or evap code.
     
  5. Apr 27, 2021 at 12:23 PM
    #5
    tirediron

    tirediron Well-Known Member

    Joined:
    Jan 19, 2019
    Member:
    #279864
    Messages:
    1,962
    First Name:
    John
    Vehicle:
    2018 4x4 Sport, Auto, BBP
    Not all fault codes will set the CEL.
     
  6. Apr 27, 2021 at 12:24 PM
    #6
    HoosierBuddy

    HoosierBuddy Well-Known Member

    Joined:
    Apr 19, 2021
    Member:
    #363152
    Messages:
    55
    Gender:
    Male
    First Name:
    Phil
    Vehicle:
    2012 Base Regular Cab 4WD Manual
    2" Lift
    You need to get a code scanner, read the code, and note exactly what it is.

    At that point, I'd be tempted to erase the code and see if it returns.

    While you can do this with a very inexpensive code scanner (maybe $15 to $20 on Amazon)....If you have a tablet or smart phone and want some more flexibility, I recommend the bluedriver OBD2 Port scanner. I got one delivered ($100) this week and it is very cool to be able to not only scan for check engine codes, but all other codes as well...also do real time graphing of selected engine parameters....and most importantly view actual sensor voltage levels with the associated specs that (I HOPE) will end up saving me a lot of money over the years by narrowing down exactly what is causing a CEL rather than guessing which one of several different causes should I start with.

    https://www.amazon.com/dp/B00652G4TS?ref=ppx_yo2_dt_b_product_details

    Phil
     
  7. Apr 27, 2021 at 4:17 PM
    #7
    nd4spdbh

    nd4spdbh Well-Known Member

    Joined:
    Oct 7, 2013
    Member:
    #114055
    Messages:
    11,487
    Gender:
    Male
    SoCal
    Vehicle:
    13 DCSB TRD OR v6 Auto
    FYI you can get codes read for free at any autozone/orileys etc. A standard OBD code reader is cheap, and you can get bluetooth OBD scanners for under 10 bucks.
     
  8. Apr 27, 2021 at 4:56 PM
    #8
    TacoTuesday1

    TacoTuesday1 Well-Known Member

    Joined:
    Jun 19, 2019
    Member:
    #296781
    Messages:
    1,554
    Gender:
    Male
    CO
    :pccoffee:
     

Products Discussed in

To Top