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

Check engine light in cold weather

Discussion in '1st Gen. Tacomas (1995-2004)' started by CoreyF, Jan 17, 2010.

  1. Jan 17, 2010 at 11:38 AM
    #1
    CoreyF

    CoreyF [OP] Corey

    Joined:
    Oct 24, 2009
    Member:
    #24821
    Messages:
    34
    Gender:
    Male
    Suffolk, VA
    Vehicle:
    2013 Tacoma 4WD SR5 Access V6
    My truck is a 1999 Tacoma 2.7L 4x4 3Rz. It has over 160K miles.

    Installed new front and rear O2 sensors and they check out fine using a good OBII scanner. Before I installed the 02 sensors the codes indicated the sensors were bad so I replaced them. The new ones now indicate they work fine. The one code I do get now is P0420. The check engine light only displays when it is pretty cold outside and even after I have driven it a long time and it is warmed up completely it stays on. Today it is warmer outside and it is not displaying at all and it is running a bit smoother. I do not visibly see an exhaust leak or feel one. According to this code it could be the coolant temperature sensor. Has anyone had this issue? Could I still have a small exhaust leak? I should would like to figure out for sure if my catalyst is failing or not since a good one cost some $$.

    All fluids are fine too as well as the gas cap. Spark plugs are good. No noises.
     
  2. Jan 17, 2010 at 11:40 AM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

    Joined:
    Dec 18, 2008
    Member:
    #11714
    Messages:
    49,897
    Gender:
    Male
    First Name:
    Ben
    Beech Creek
    Vehicle:
    05 Tundra SR5 (+250k AND COUNTING), 88 SR5 PU (SOLD), 98 TRD OR (CRUSHED)
    5100's all on fours
    What brand of sensor did you use?
     
  3. Jan 17, 2010 at 11:58 AM
    #3
    CoreyF

    CoreyF [OP] Corey

    Joined:
    Oct 24, 2009
    Member:
    #24821
    Messages:
    34
    Gender:
    Male
    Suffolk, VA
    Vehicle:
    2013 Tacoma 4WD SR5 Access V6
    These 02 sensors were bought from my Toyota dealer parts department
     
  4. Jan 17, 2010 at 11:58 AM
    #4
    CoreyF

    CoreyF [OP] Corey

    Joined:
    Oct 24, 2009
    Member:
    #24821
    Messages:
    34
    Gender:
    Male
    Suffolk, VA
    Vehicle:
    2013 Tacoma 4WD SR5 Access V6
    Denso
     
  5. Jan 17, 2010 at 12:19 PM
    #5
    CoreyF

    CoreyF [OP] Corey

    Joined:
    Oct 24, 2009
    Member:
    #24821
    Messages:
    34
    Gender:
    Male
    Suffolk, VA
    Vehicle:
    2013 Tacoma 4WD SR5 Access V6
    I should also mention, I installed these 02 sensors a few months ago while the weather was warm and have not had any engine lights or any other issues until it just began to get cold outside so my thinking is that the sensors are fine. Also, I am aware that if you drop these sensors or bang them at all that this may damage them. I was carefull not to drop or bang them or anything when installing them.
     
To Top