Service Engine soon light turns ON and OFF
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Service Engine soon light turns ON and OFF in Past Cadillac Vehicle Discussion; My 97 Deville Service Engine Soon light goes on and off occasionally. I ran a diagnostic check on it, but ...
  1. #1
    97LacDeville is offline Cadillac Owners Member
    Join Date
    Nov 2004
    Posts
    3

    Lightbulb Service Engine soon light turns ON and OFF

    My 97 Deville Service Engine Soon light goes on and off occasionally. I ran a diagnostic check on it, but none of the codes check out. I went to the dealer awhile ago and they said it was an O2 Sensor. I'm not sure which one it is, but I let this go for about 6 months. Can't remember if there's 4 O2 Sensor's or 6. I think my fuel maybe running a little lean or too rich, but nothing serious has happened. What should I do?

    F.Y.I. 114k miles so far, Repairs: new plugs, wires, radiator, and fuel pump(not bad).

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  3. #2
    Young DeVille's Avatar
    Young DeVille is offline Cadillac Owners Fanatic
    Automobile(s): 1997 Dark Adriatic Metallic Blue Deville Sittin on 20 Chrome
    Join Date
    Mar 2004
    Location
    Washington, DC
    Age
    32
    Posts
    328

    Re: Service Engine soon light turns ON and OFF

    It happens to me from time to time. I relized it happens only when I mix PLUS and PREMIUM GASES. I also heard it could be the O2 Sensor... As far as 4 or 6 tem I really don't know. But I was told to check for codes everytime to be on the safe side... Until the codes check out I wouldn't worry about it to much.

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