Service Engine soon light turns ON and OFF

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 2 of 2
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

    LightbulbService 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).

  2. Remove Advertisements

  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
    Washington, DC

    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.

  4. Remove Advertisements
    Cadillac Forums

+ Reply to Thread
Gear in this thread - Powered by O'Reilly Auto Parts

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

What Cadillac(s) do you own? (Or type NONE)

Please select your insurance company (Optional)

Your date of birth and age are displayed in several places on the forum. Only the administrator will have access to your date of birth should you choose to hide it via the privacy option below.


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts