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Thread: Codes 172, 173...running rough

  1. #1
    Join Date
    Jul 2007
    Location
    Memphis area
    Posts
    411

    Codes 172, 173...running rough

    I have a '95 SC that is running rough and the Check Engine light comes on. I pulled two codes, 172 & 173 with a code scanner. Any advice? I am thinking it is a sensor of some kind.

    Thanks!
    Ray

  2. #2
    Join Date
    Mar 2007
    Location
    East Lyme, CT.
    Posts
    156
    Code 172, o2 sensor indicates lean, and 173 o2 sensor indicates rich, both bank 1. I had this a few weeks ago, just replaced O2 sensor, and its fine now.
    Good Luck,
    Brian

  3. #3
    Join Date
    Aug 2002
    Location
    Salisbury, NC
    Posts
    81
    Same thing here I had those codes as well. My CEL would come on for a few seconds at a time every few minutes I pulled out the O2s and my right one was visibly covered with soot and the left pretty clean. I went ahead and changed them both for right under $100. The best price I found on them was at O’reilly auto parts and I think you have them in your area. Once I change them the light was gone and after the relearn the car runs great and improved my MPG as well.

  4. #4
    Join Date
    Jul 2007
    Location
    Memphis area
    Posts
    411
    Fantastic guys! Thanks! I will get right on it!

    Ray

  5. #5
    Join Date
    Jul 2007
    Location
    Memphis area
    Posts
    411
    Ok. I replaced both O2 sensors and seemingly cured that problem. Now the CEL comes on at random and the car sputters. The code scanner does not pull any codes. Any suggestions?

  6. #6
    Join Date
    Jan 2003
    Location
    Roswell, Georgia
    Posts
    594
    Try disconnecting the battery to clear EEC memory from old O2 sensors.

  7. #7
    Join Date
    Jul 2007
    Location
    Memphis area
    Posts
    411
    Quote Originally Posted by sail7seas View Post
    Try disconnecting the battery to clear EEC memory from old O2 sensors.
    Yep, I did...no luck...dang it!

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