Service Engine Soon!

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 Seville / Cadillac Eldorado Forum Discussion, Service Engine Soon! in Past Cadillac Vehicle Discussion; Today I was at the redlight and just happened to notice that my service engine light had came on. I ...
  1. #1
    ej2000n's Avatar
    ej2000n is offline Cadillac Owners Fanatic
    Automobile(s): 2007 STS
    Join Date
    Sep 2005

    Service Engine Soon!

    Today I was at the redlight and just happened to notice that my service engine light had came on. I pulled the codes a minute ago and got these:

    PCM 0151 heated O2 sensor circuit low voltage bank 2 sensor 1
    PCM 0174 Fuel Trim system lean bank 2
    PCM 1139 Heated O2 sensor insuff. switching bank 1 sensor 2

    This makes sense to a point but performance wise I have no idea what they mean and what caused the codes to appear. Is this major or something that can be corrected. I'll wait for a response before I clear them.

  2. Remove Advertisements

  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: Service Engine Soon!

    Sounds like 2 sensors failed causing P0174 would be my guess. Bank 2 Sensor 1 is on the front manifold. Bank 1 Sensor 2 is the pre-cat sensor. See if anyone agrees with me.

  4. Remove Advertisements
    Cadillac Forums

+ Reply to Thread

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