98 taho codes

Discussion in 'The Garage' started by TXsizeK5, Dec 11, 2003.

  1. TXsizeK5

    TXsizeK5 1/2 ton status

    Aug 26, 2001
    Likes Received:
    College Station, TX
    my buddy has a 98 tahoe with this problem... anyone got a clue?

    "98 Tahoe after the SES light came on yesterday and I get a PO430 code which means that the 'catalyst system efficiency for Bank 2 is below the threshold for the current engine operating conditions". I have determined that Bank 2 is the passenger side exhaust.

    There are four sensors under there. I assume all are O2 sensors. There are two before each cat and two after each cat.

    What is broke and what needs to be fixed? Sterling GM says $900"
    btw its a 350 vortech

    Thanks guys

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