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  1. #1

    Default code 174 Heated O2 sensor

    Great info on the site, on heated O2 sensors which code 174 is about.
    My diagnostic, PO174 says failed heated oxygen sensor, Bank 2 sensor 1.

    What side is Bank 2? Is this sensor before the cat converter?

    2003 Suburban 4X4 1500

  2. #2

    Cool code 174 heated o2 sensor

    Bank 2 is passenger side and sensor 1 is before cat.

  3. #3

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    Just make sure you actually get the passanger side pipe, they do cross around underneath a little, but yes position 1 is pre cat and position 2 is post cat
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

  4. #4


    My diagnostic, PO174 says failed heated oxygen sensor, Bank 2 sensor 1.
    If I may, I would like to clarify what your diagnostic is really saying. In general, there are no trouble codes for "part x has failed." My code list defines P0174 as "fuel trim too lean bank 2." The computer is using the O2 sensor signal to optimize the air/fuel (A/F) mixture. When this code is set, it is saying, "No matter how much fuel I tell the injectors to dump into that bank of the engine, I can't get the O2 sensor signal for that side to read normal." Certainly, this could be due to a faulty O2 sensor, but there are other possibilities as well (a vacuum leak or loose electrical connection, for example).

    Your strategy for diagnosing these things depends on you. Some prefer to troubleshoot by the book, which means not replacing anything until they feel like they've found the real cause of the code. Others, especially with O2 sensor codes, prefer to replace the O2 sensor as a "guess," and, if that doesn't resolve the issue, then go through the more detailed process of diagnosing the real fault.
    '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

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