Check Engine Light Came On But Then Turned Off. It Was The Oxygen Sensor. Is It Broken

Posted in Oxygen Sensors
  • Last week, the check engine light in my 1998 Toyota 4runner came on. After driving about 115 miles or so, the light randomly turned off. I was a little worried about it so my brother took it to get it checked out. Apparently it was the oxygen sensor.
    Next weekend I am going on a small road trip and I will be driving about 800 miles between 3 days. Should I be ok since the light is off? Is the sensor probably broken or was it a temporary thing?

    There are 4 Answers for "Check Engine Light Came On But Then Turned Off. It Was The Oxygen Sensor. Is It Broken"

    1. "not Today, Zurg!" says:

      It may of been a glitch……If it’s going bad it will come on again as soon as the car looses signal from the component.

      No telling what it really was…….The light being on just tells us the car Is holding a problem code.

      Most auto parts stores will plug you in free of charge…….thats how they sell a lot of their parts today.

      Ask them if they have an OBD2 code reader to read a check engine light………wont take 5 minutes to plug it in and have it read your cars electrical web from one hook up point

    2. Matt M says:

      I would say that the it has a timer on it after so long it will go off on its on but then again if you have it read like at auto zone this will clear it for a little while but if your truck is not running any different and not using allot more gas i would not worry about it sometimes they will effect things sometimes they wont

    3. Kenny D says:

      The fault no longer exist if the check engine light turned off but the diagnostic trouble code will remain stored until it is cleared. Whatever the 02 sensor problem is it appears to be an intermittent problem and so it is important to note that fault code before clearing it because it will point you to the offending 02 sensor so that maybe you can take time to clean it and check the connection in hopes of preventing another fault.

    4. Nomadd says:

      There are different O2 sensor codes. The sensors don’t last forever, and when they start going bad you get “O2 sensor voltage out of range” or something like that. If the connector and wire look good, and the sensor is over 100,000 miles old, you just need a new one.
      It won’t really hurt much if it goes bad. It might run lean and be harder to start when it’s half warm. And the light will stay on, so you won’t know when a more serious code comes up.
      The sensor signal always goes up and down, so when they start going bad the light is intermittent.

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