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  1. #1

    Default O2 Sensor - Bank 1 - Where is it?

    I'm pulling a P0135 code - bad O2 sensor on bank 1 sensor 1.

    Where is the bank 1 O2 sensor located on a gas 2004 6.0 2500HD?

    Common sense tells me to look at it this way - am I right?

    Bank 1 Sensor 1 - Driver's side before convertor (front)
    Bank 1 Sensor 2 - Driver's side after convertor (rear)

    Bank 2 Sensor 1 - Passenger's side before convertor (front)
    Bank 2 Sensor 2 - Passenger's side after convertor (rear)
    Last edited by F E Knucklebuster; 02-09-2010 at 09:06 AM.

  2. #2


    I think that's right. Bank 1, by convention is the bank with the #1 cylinder. I haven't looked at it in a year or so, but doesn't GM start numbering cylinders from the driver's front? Quickest answer would be to pull out a manual and look it up (my manual's at home, so I can't look until then).
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

  3. #3

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    the banks go buy your front cylinder, so cylinder one is bank one,
    sensor one is pre cat and #2 is strictly there to monitor the cat
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

  4. #4


    It's just below the driver side manifold in the crossover pipe. super easy! That sensor will cause havoc when it goes bad, I had one fatten up the short term fuel trim so bad, that it blew black smoke out the tail pipe like a cummins.

  5. #5


    O2 bank 1 sensor 1 is the driver's side, front O2 sensor, the one before the CAT...

    2014 Camaro SS - 2SS, RS pkg., short-throw shifter, NPP perf. exhaust, BMR strut-tower brace, Cold Air Inductions cold air intake

  6. #6


    Thanks. Might have been a false alarm. I reset the Check Engine Light and haven't thrown any codes yet. If I need to change any sensors I know where they are now.

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