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


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

Question type: Maintenance & Repair

15 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.

11 out of 11 people think this is 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

8 out of 8 people think this is 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

13 out of 13 people think this is 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

20 out of 20 people think this is 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.

10 out of 10 people think this is 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.

9 out of 9 people think this is helpful.

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

207 out of 207 people think this is 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.

19 out of 19 people think this is helpful.

Ain't life grand?

4 out of 4 people think this is 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

7 out of 7 people think this is helpful.

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

58 out of 58 people think this is 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.

7 out of 7 people think this is 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.

5 out of 5 people think this is 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!

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

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