any help with these codes please

Discussion in 'GM Powertrain' started by black4door, May 3, 2010.

  1. black4door

    black4door New Member

    when scanned my 2003 Chevy Tahoe 5.3 l 2wd reads:
    P0135 - Heated Oxygen Sensor (HO2S) Heater Performance Bank 1 Sensor 1
    P0137 - Heated Oxygen Sensor (HO2S) Circuit Low Voltage Bank 1 Sensor 2

    I believe this means I need to replace 2 oxygen sensors but I think there are 4 on the car 2 upstream and 2 downstream of the cat converter. which 2 to replace or just replace all 4? anyone know exactly what these 2 codes mean?
    any help would be greatly appreciated.
    Last edited: May 3, 2010
  2. dsfloyd

    dsfloyd Epic Member 5+ Years ROTM Winner 1000 Posts

    if I am reading it right, since they are both on bank 1 it will be on the same side. Bank 1 is on the driver side. sensor 1 is before the cat and 1 after the cat. Can be a loose/corroded wiring or most likely replacement and they arent cheap, but easy to do.
  3. black4door

    black4door New Member

    thanks for the information I replaced all 4 and it seems to be fixed

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