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P0136 code for B1S2 Oxygen Sensor for 2005 Tundra

Discussion in '1st Gen Tundras (2000-2006)' started by Tundra4x4man, Jan 31, 2020.

  1. Jan 31, 2020 at 6:07 PM
    #1
    Tundra4x4man

    Tundra4x4man [OP] New Member

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    Need some help....I have a 2005 Tundra Limited 4x4 Crew Cab 4.7 L with 230,000 miles and check engine light is on with the P0136 error code for B1S2 oxygen sensor. Mechanic replaced B1S2 with a Denso 234-4260 and check engine light was out for about 50 miles and came back on. I took it back to the mechanic and he disconnected, inspected connector and wiring and reconnected electrical and cleared the code. The check engine light came back on with P0136 code after about 30 miles. I took it back to mechanic and he removed the B1S2 sensor and he it took back to where he got it and got a brand new (in plastic bag) replacement of same Denso 234-4260 oxygen sensor. He installed new sensor and cleared code. After another 30 miles the check engine light came back on with the same P0136 code pointing to the same B1S2 sensor and the mechanic is not sure what could be causing it. Has anyone had this issue and what might be necessary to resolve?
     
  2. Jan 31, 2020 at 6:25 PM
    #2
    Festerw

    Festerw New Member

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    Change the front sensor too. Sometimes the discrepancy between the two sensors gets far enough out with and old/new sensor and still trips the code.
     
    BubbaW and 02goes like this.
  3. Jan 31, 2020 at 8:49 PM
    #3
    02goes

    02goes New Member

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    These oxygen sensors are crazy. After getting the trk and appx 1000 miles later the O2 sensor codes appeared. Cleared them a couple of times and same codes came back appx 100 miles thereafter. Funny thing is the oxygen sensor codes stopped appearing after the last code clear. No more codes @ appx 1500 miles later.
     
    Last edited: Feb 1, 2020
  4. Feb 1, 2020 at 6:16 AM
    #4
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Correct me if I’m wrong. Sensor 2 is post catalytic convertor?

    If sensor 1 works and exhaust goes through the cat and triggers sensor 2 wouldn’t a problem be in the cat (assuming the sensor 2 is new and working).

    Cats bad?
     
    imDementeD and FrenchToasty like this.
  5. Feb 1, 2020 at 8:14 AM
    #5
    Festerw

    Festerw New Member

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    Correct on location. My (limited) understanding is that #2 just looks for a predetermined change in exhaust gas from the front sensor. It could mean a bad cat or it could just mean the front sensor is for argument sake on the fringe of the correct range and the new sensor being more sensitive has a hissy fit because it's seeing enough change. Then replacing the front sensor adjust the fuel trims just enough to bring the values back into standards.

    Plus a new sensor is a lot cheaper than a new cat for troubleshooting purposes.
     
  6. Feb 1, 2020 at 8:17 AM
    #6
    FrenchToasty

    FrenchToasty Desert rat

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    Do we know the Denso part number? Oem o2 seem to be pricey
     
  7. Feb 1, 2020 at 8:39 AM
    #7
    PCJ

    PCJ New Member

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    I had a similar situation. Back in October my 2.4L 2002 Camry with 255K miles threw a PO420 code. Could be a catalytic converter or O2 sensors. Cleared the code and it was back in a couple hundred miles. Didn't have the money to spend with the holidays coming up.

    Talking to one of my sons he told me about a fuel additive that he learned about at job that actually works to clean catalytic converters and O2 sensors. Stuff called 44K. Figured it couldn't hurt to try. Ran a can full through the fuel tank. Cleared the code afterwards. 6k miles later now and the code hasn't come back. Something you might want to consider trying.
     
  8. Feb 1, 2020 at 9:22 AM
    #8
    Festerw

    Festerw New Member

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    Looks like 00-04 is Denso 234-4169 for both upstream about $45
    05-06 is 234-9051 for both upstream about $130
     
    FrenchToasty likes this.
  9. Feb 3, 2020 at 7:41 AM
    #9
    Tundra4x4man

    Tundra4x4man [OP] New Member

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    Thanks a bunch!!! I have added Sea-Foam additive in the past when the check engine light has come on and it has cleared the light being on. I did try it again and will try to find the "44K" but a brand new sensor (Denso 234-9051: $122.30 Amazon) has been ordered and hopefully installed on Wed.
    I will update this thread to keep everyone posted.
     
  10. Feb 11, 2020 at 9:03 AM
    #10
    Tundra4x4man

    Tundra4x4man [OP] New Member

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    So when I tried putting Sea-Foam in half of a tank of regular and filling it up with premium, which has turned the check engine light out in the past, but didn't seem to work this time, I ordered the Denso 234-9051. The B1S1 sensor arrived and before I could get it installed the check engine light went out. I thought I could return the part but the check engine light came back on 2 days later. The meter showed it was B1S2 but I knew it was good. So I had the B1S1 sensor replaced and the check engine light has been off ever since.
    Thanks for all the help!!
     

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