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  1. #1

    Default any help with these codes please

    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 by black4door; 05-03-2010 at 05:29 PM.

  2. #2


    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.
    2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Granatelli MAF sensor, Throttle body spacer, Magnaflow exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer ST) and 4.10 gears, Rhino Liner, EGRUSA fender Flares and widow visors, extended stainless steel brake lines, firestone airbags w/onboard air compressor, Pioneer Avic X940BT navigation, Accel backup camera.
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
    NRA Life Member

  3. #3


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

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