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Catalyst efficiency below threshold code

Discussion in '1st Gen. Tacomas (1995-2004)' started by filas the cat, May 29, 2011.

  1. May 29, 2011 at 6:34 PM
    #1
    filas the cat

    filas the cat [OP] dont expect hugs from people with no arms

    Joined:
    May 29, 2011
    Member:
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    Anchorage AK
    Vehicle:
    2001 Tacoma 2.7 liter
    3 inch lift
    :eek:So I keep getting a catalyst below efficiency code. would that mean the downstream O2 is bad or the upstream?
     
  2. May 30, 2011 at 1:28 PM
    #2
    RAT PRODUCTS

    RAT PRODUCTS RAT Products

    Joined:
    Apr 12, 2010
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    #35140
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    Ryan
    Farmington, MN
    Vehicle:
    2016 Sierra Denali
    Good luck with that code... I had it on my 96 and I replaced both oxygen sensors, the cat converter, and manifold and it would not go away. Start with the rear oxygen sensor.
     
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