100K engine light won't stay off....... 1996 850 GLT.. I can turn it off but come back on.

Discussion in 'Volvo 850' started by Boll Weevil, Feb 16, 2004.

  1. Boll Weevil

    Boll Weevil Guest

    Well, I've figured out how to turn the 100K "service engine" light off
    but it keeps coming back on. To turn the light off, I disconnected a
    battery wire for at least for 24 hours. When I reconnect the wire and
    start the car, the engine light stays off for a while then it come
    back on after about 200 to 300 miles. After the engine light
    originally came on, I had a tune up done but I didn't notice any
    performance difference and it didn't keep the light from coming back
    on. Can anyone suggest what needs to be done to keep the engine light
    off? Thanx.
    Boll Weevil, Feb 16, 2004
  2. [Boll Weevil] (Mon, 16 Feb 2004 01:15:56 -0600):
    Getting the garage that did the "tune-up" to reset it.
    Svein Tore Sølvik, Feb 16, 2004
  3. Boll Weevil

    Boll Weevil Guest

    They did reset it but it came back on after a few hundred miles.
    Boll Weevil, Feb 16, 2004
  4. Boll Weevil

    John Horner Guest

    The light is on because the engine controls are sensing a defect. If the
    defect remains the light will keep coming on until whatever is wrong is
    fixed. Whoever did your "tune-up" probably did a list of standard things
    (plugs, filters, etc.) but did not read out the error codes and advise you
    as to proper corrective actions.

    In your case it sounds like you need to have a competent tech. pull the
    error codes and take it from there.

    It could be any of dozens of things. By law modern car systems are required
    to monitor things which potentially can cause increased emissions and then
    light the service light when any of the conditions is sensed.

    John Horner, Feb 16, 2004
  5. [Boll Weevil] (Mon, 16 Feb 2004 10:21:08 -0600):
    In that case they did it wrong, and you should go back and get it done
    properly :)
    Svein Tore Sølvik, Feb 16, 2004
  6. Boll Weevil

    G Klein Guest

    Which Light is on ?
    The Check Engine Light or the service light if it is the check engine light
    there is a engine code that keeps setting the light off , if it is the
    service light have the repair shop reset the light
    G Klein, Feb 16, 2004
  7. Boll Weevil

    El Mecky Guest

    Pull the bulb! This way we fix many problems in our taxi's (mercedes), like
    ABS, SIPS and other problems.
    El Mecky, Feb 18, 2004
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