Question about 1997 Cadillac Seville

2 Answers

Service Engine Soon

The "Service Engine Soon" light stays on.
I changed the oil and checked all fluids to no avail.
Cadillac Dealer wants $130 just to take a look at it.
Help !!!!

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  • tekcormn Dec 13, 2008

    Here are the codes:
    Trouble shooting P0143 OEM Brand OBDII

    The PCM has determined that the inout voltage from oxygen
    sensor 3 in bank 1 is too low for current operating
    condtions. (Oxygen sensor 1 is closet to the cylinder head ..)

    Trouble shooting P0143 OEM Brand OBDII
    Definition
    HO2S 13 circuit condition (Heated Oxygen Sensor Bank 1
    sensor 3)

    Explanation -
    The powertrain control modules uses the oxygen sensor to
    calculate the air/fuel ration in the exhaust.
    Probable cause
    1. Oxygen Sensor Defective
    2. Fuel system running very rich or lean - check other codes
    first.
    3. Engine misfire condition - repair
    4. Fuel pressure very hugh or low fuel pump or pressure
    regulator.

  • donmil492 Feb 08, 2009

    i went to autozone and had 5 codes all dealing with the co2 sensor and the oxygen sensor can i replace these myself

  • Anonymous Mar 26, 2014

    SERVICE ENGINE SOON light is on.

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2 Answers

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  • Expert
  • 251 Answers

It its more than likely ur gas cap try tightening it and the light should go off

Posted on Dec 04, 2008

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  • Cadillac Master
  • 61,168 Answers

The light is on to alert U to the fact that a fault has occurred in the engine management system(s) or a part of the emission control system, there are over a 100 different problems that turn this light on, take the car to any Kragen auto parts,Auto Zone, Shukes etc and they will test the system for free, it could be as simple as a loose or defective gas cap seal, no way to tell until you give me the trouble codes.

Posted on Dec 04, 2008

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1 Answer

How can I determine with certainty the cause of a Service Engine Soon light?


Personally I would do a complete engine service, for example Air and Oil filters, Oil and Plugs (it may also be worth changing the coolant as I am not certain of the parameters that are monitored by the system) If the light still remains on then the most likely problem is the Engine Managment Unit or a sensor.

Nov 28, 2011 | 2004 Cadillac Deville

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How do i reset the service engine light soon? It stays on after i have changed the oil and filter and reset the oil life sensor to 100%.


The service engine soon light indicates a problem.
Take the vehicle to AutoZone and have them read the computer code.
They can give you an idea of what the problem is and reset the light for you.
BTW the service is free

Aug 15, 2011 | 2003 Cadillac Deville

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My change oil light never goes off even though I had it changed and now my service vehicle soon light is on even though its been running fine


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Dec 13, 2010 | 2001 Pontiac Grand Am SE

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What is oil change schedule for 2007 DTS also transmission fluid change schedule


Your vehicle's engine requires oil meeting GM Standard GM6094M. You should look for and use only an oil that meets GM Standard GM6094M. SAE 5W-30 is best for your vehicle.
The best Brand is 5W-30, Mobile 1 synthetic oil, but you can use Castrol GTX 5W-30, too. It is very important to use only one barand of engine oil.
When the CHANGE ENGINE OIL SOON message in the Driver Information Center (DIC) comes on,
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If the engine oil life system is ever reset accidentally, you must service an oil change for your vehicle within 3,000 miles (5 000 km), or three months wichever comes first, since your last service.
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Dealer recomend to change the transmission oil and filter at Maintenace II, at 50K, and the air filter too. Use only DEXRON®-VI Automatic Transmission Fluid.
The dealer sugest to flush the radiator every 75K and use 50/50 mixture with distilled water, and use only DEX-COOL. I recommend to flush every 50K.

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Service Engine soon light stays on but car runs


Probably needs an oil change (if it already hasn't had one) and the light reset. If that doesn't help, take it and have a code scanner hooked up to it, to find out why the light is on.
If there is an autozone or advanced auto near you, go there, and tell them you have an engine light on and need to read the code.
They usually don't charge, other places do.

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The service engine soon light stays on i just change oil


you can try taking the positive cable off for about 3-secs and check in you owner manual to see if it tell you how and if you do have one try this website www.edmunds.com to see if you can download one for you car.

May 25, 2009 | 1999 Cadillac DeVille

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Service soon light came on on my 86 cadillac deville so i was wondering is that the same thing as a check engine light or different?


"service soon" is a reminder that it needs regular maintenance, and usually the dealer has a tool to reset that light on the dashboard, which can be expensive to buy.

If you do all the maint yourself, and you know that all the fluids have been replaced or capped off, you could cover the light with a piece of black electrical tape, then go on with your life.

May 24, 2009 | 1986 Cadillac DeVille

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Whath does "service engine soonmeans"


SERVICE ENGINE SOON and SERVICE ENGINE NOW are 2 amber warning lights pertaining to the vehicles computers.SERVICE SOON advises you of a problem, although not an emergency should be attended to promptly. Your technician can trace the problem by accessing fault codes through the climate control panel. SERVICE NOW indicates a more severe problem which will most likely precipitate a failure / breakdown. The CHANGE OIL LIGHT indicates by time and mileage is a separate light.

Mar 20, 2009 | 2000 Cadillac DeVille

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Resetting service engine soon light in my 2002 cadillac escalade


  1. Turn the ignition key to the RUN position.
  2. Press the INFO button on the Driver Information Center (DIC) button to display ENGINE OIL LIFE.
  3. Fully push and release the accelerator pedal 3 times within 5 seconds. If the CHANGE OIL SOON light flashes 2 times, the system is reset. However if the light comes on and stays on for 5 seconds, the system did not reset. Repeat the he procedure if the system does not reset.
  4. Turn the ignition OFF.

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