my service engine soon light came on what could be the problem


Asked by rea7 Apr 26, 2008 at 10:58 PM about the 2000 Cadillac DeVille Sedan FWD

Question type: Maintenance & Repair

20 Answers

Could be something as simple as the gas cap not being on tight enough, or something really really serious. You should probably get it checked out.

14 people found this helpful.

go up to advance auto parts they will plug in a computer to it and tell you what code its throwing and what u need

12 people found this helpful.

I work at a shop, I wouldn't advise taking your car to advance, we've had people come in who have been there several time without success. They check it so they can sell you a part to install if that doesnt fix it then you have to buy another part to try. We had a guy come in with a Ford F-150 who had been to advance, he replaced his oxygen sensor 4 times because that was one of the possible causes of the code. If the guy at advance knew to check out the other possible issues the customer could have saved alot of time and money. Take it to a reputable auto repair shop, it may cost just a bit more on the surface but it is well worth it in the end, don't sacrafice quality

23 people found this helpful.

a sevice engine soon light could just very well be changing your oil... it could mean a bad O2 sensor... it could mean you have a fouled spark plug... it can also mean something stupid as gas cap not on right and just puttin the gas cap back on will not remove the light from your dashboard... you will have to take it to a good mechanic... not advance auto parts or any other chessy auto parts store... they have to scan the car and clear the code(s) after whatevers wrong is fixed... i may be a woman but i kno what im talkin about... i am a mechanic myself... i wish you good luck and i hope you find your solution

37 people found this helpful.

Mine will come on intermittently, when I stomp the gas, or when I first start it. I'm thinking the problem here has as much to do with the light itself as anything else.

14 people found this helpful.

It could be something as simple to as low oil level, or a 50,000 or 75,000 mile check up, to a gasket. Take it to a repair shop, and just have them look at it. If your car is still running smoothly, it's probably nothing big.

14 people found this helpful.

Nothing is wrong, no codes. How do I turn off the light??

260 people found this helpful.

I have a 2003 Deville base, and my light came on a few weeks ago. It was a problem with the air intake and caused about $500 to fix.

22 people found this helpful.

Ain't life grand?

6 people found this helpful.

Don't bother taking it in at all. I have a 99 f150 that has had the same light on for the last 7 years, and nothing is wrong. I brought it to a family mechanic, and he said it was just a part that goes bad and it dosent need to be replaced, its just a bottomless money pit if you keep bringing it in. CT

8 people found this helpful.

My service engine light came on, i drive a cadillac deville 2004, and the engine sounds loud. Any suggestions>?

94 people found this helpful.

I have a 2004 dts after I have 3 gas caps changed 2 smoke tests and my shop which I have been going to for some time and I believe they are good still can't figure it out.

12 people found this helpful.

I have to say as a member of Advance Auto that you are sadly miss informed, or mislead at our purpose as a business. Our sole focus is to help the customer with their automotive needs based on their descriptions and problems. While we all train very profusely on learning all makes, models, years, and diagnosis no one person is 100% efficient. We do not have a lift, or 5,000.00 scan tools to diagnose to a "t" what is wrong with your car, as a mechanic myself I've found the best way to fix your own is to start from the most reasonable problem area at the lowest cost and work your way towards fixing the problem. I apologize that you or your customers had an unsatisfactory experience at one of our stores. However, I assure you upon entry of our store we are purely focused on helping our customers to the best of our abilities, good pricing on premium parts, and a good customer service experience.

18 people found this helpful.

Everyone that has this car and gets a lean code when reading the check engine codes at AutoZone . Your problem is most likely the intake plenum. I got a replacement on line for under $50. It comes with all the replacement gaskets for removing the plastic intake manifold to easily replace the plenum. This is the correct way to change it as the mechanic can inspect the condition of all vacuum lines on the entire intake system and most importantly the intake manifold itself. My problem was the plenum. It's right above the hot engine and is made of rubber. They ALL crack and leak. The entire cost ,and done right ,was under $250 including parts. Changing the spark plugs, especially the rear four, is a wise move while the way is clear with the injectors and vacuum lines removed. The injectors needing to be moved out of the way is another reason to have a professional do this job. Any other issues...The mechanic will make you aware of, if he is a good mechanic. Good luck....My 2003 is running beautifully at 104,881 miles!

2 people found this helpful.

need to have the emmission test this month. get the lean message. put in octane additive it sometimes goes out for a short while. how do i get it through emmissions . cant have serv eng light on

8 people found this helpful.

same problem w/ 99 cadi lean message, need to have emmissions test.

2 people found this helpful.

Ran through a puddle of water in the light came on


Service engine soon for Cadillac 99. What does it mean?

15 people found this helpful.

My son have a 2001 Cadillac deville dts and his problem on his car his service engine light is on while he driving so i look it up on what kind of car he have. So the service engine light message say this to clear the diagnostic codes can l remove the powertrain. Control module bat fuse to turn light off the codes are reading 171and 174 also engine coolant light coming on but now low and no coolant loss to clear codes you need a scanner disconnecting power may cause the computer to need to relearn and may turn off the light until the diagnostic get ready agains you need someone with a scanner on a car and fix the problem causing the light to go on

1 people found this helpful.

Your Answer:


Looking for a Used DeVille in your area?

CarGurus has 15 nationwide DeVille listings and the tools to find you a great deal.

Postal Code:

Cadillac DeVille Experts

  • #1
  • #2
  • #3
View All

Find great deals from top-rated dealers


Related Models For Sale

Used Lincoln Town Car
14 listings starting at $3,888
Used Cadillac Escalade
4 Great Deals out of 342 listings starting at $7,700
Used Chevrolet Impala
20 Great Deals out of 505 listings starting at $2,200
Used Mercedes-Benz S-Class
8 Great Deals out of 176 listings starting at $8,988
Used Chevrolet Silverado 1500
91 Great Deals out of 4,705 listings starting at $4,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.