1997 Check Engine Light

Discussion in 'General Motoring' started by hubby, Jul 23, 2003.

  1. hubby

    hubby Guest

    Is there anything that causes the check engine light to come on after a
    certain mileage (i.e. 100k)? Thanks!
    hubby, Jul 23, 2003
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  2. The check engine light is turned on by the on-board computer when it
    senses something that is out of range or malfunctioning. There are
    tens of different sources for the CE light to turn on. Have your car
    connected to an OBD-2 reader. There is a plug in the dashboard for
    this function. The reader will tell you the fault code and you can
    check into a list to find was is deemed wrong in your car. Presently
    mine has the CE light ON for a defective coolant temperature sensor.
    A rather hard to reach sensor. Grrr!
    Felix Crashalot, Jul 23, 2003
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  3. You can check the O2 sensor on most cars,

    usually three wires, 1 earth, 1 heater supply (they need to run at about
    800°C) and one signal. Check between the signal and earth. The one on my car
    gives 1v for 1% o2 (before the cat). After the cat, I suppose the O2 figure
    should be less as the cat rcombines the O2 with the CO ?
    Richard Gary Clark, Jul 25, 2003
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