Neon o2 Sensor

Discussion in 'Neon' started by Cornelius Washington, Feb 19, 2004.

  1. Cornelius Washington

    Cornelius Washington Guest

    I have a '96 Neon SOHC with 158k miles. I had the upstream o2 sensor
    replaced about 3 months ago. Now, I'm getting the code 21 again along with
    52. Could the o2 sensor be bad this quickly and making the engine run rich
    or could there be another problem that's causing the sensor to foul? I'm
    losing approx. 10 mpg since this started happening. Any ideas are
    appreciated.

    Thanks,
    Cornelius
     
    Cornelius Washington, Feb 19, 2004
    #1
  2. Cornelius Washington

    Daniel J. Stern Guest

    Yes, especially if a Bosch O2 sensor was installed.

    DS
     
    Daniel J. Stern, Feb 19, 2004
    #2
  3. Cornelius Washington

    mic canic Guest

    code 52 is a running rich code which could indeed be caused by a new failed o2
    sensor esp. if it's a bosch, get a factory one, a scan tool with a good data
    stream would be something that you might want to get your hands on.
    could be a few other things affecting it too
     
    mic canic, Feb 19, 2004
    #3
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