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Both downstream O2 sensors reading 0 volts

Discussion in '2nd Gen. Builds (2005-2015)' started by Carl1886, Oct 17, 2020.

  1. Oct 17, 2020 at 6:20 AM
    #1
    Carl1886

    #1
    Carl1886 [OP] New Member

    Joined:
    Oct 17, 2020
    Member:
    #344043
    Messages:
    1
    Gender:
    Male
    First Name:
    Jackson
    Vehicle:
    2006 White Tacoma PreRunner
    Recently a friend of mine came to me saying that his 2006 Tacoma with the 4.0 had a check engine light and asked if i could scan it knowing I had Techstream. Scaning it revealed it had two codes P0420 and P0430 low catylist efficency bank one and two. So I went to the live data tab and saw both O2 sensors had a reading of zero volts. Does 0 volts coming from an O2 sensor mean that its bad? I've never seen this before some help would be greatly appreciated.

    3.jpg Capture2.jpg
     
    Carl1886, Oct 17, 2020
    #1

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