Question about Buick Century

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My Service Engine Soon light lit up on my 2004 Buick Century. Typically, I've had it come on if I didn't tighten the gas cap all the way. Usually, if that is the case, it turns off after starting and driving the car a couple of times. I'm on day 2 of the light being on. I looked at the gas flap where you put the fuel nozzle in and it seems to not be flush with the opening, so I was wondering if that could be what is causing the problem (provided it's something that simple). I just can't remember if it has been flush with the opening before. Any thoughts?

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Do you have a "Check engine" light or a "Service engine soon" light.Could be you are just being reminded to get an oil change as the "Service engine soon" light will come on automatically at a certain mileage after it was last reset.Your vehicle handbook in the glove compartment should tell you how to reset your "Service engine soon light" yourself. If you have a "Check engine" light on,you can have someone read your "codes" and find out what system the vehicle is having a problem with.

Posted on Apr 29, 2017

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Anonymous

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SOURCE: 2003 Buick Century Custom and the Service Engine Soon Light

You will need to have a reputable mechanic do a diagnostic check on the car to determine the problem. This should pull up a code number in your car's computer and help point the mechanic and you in the direction of the malfunctioning part/s.

Just today, I had a diagnostic check done on mine for nearly $45.00. The mechanic was able to figure out the reason why my service engine light was staying on. I knew my car's radiator fans failed to run when car's engine was hot except when the A/C was running. I had changed out the sensors and was never able to get the light to go out or get the fans working. They were able to determine that the 25 amp fuse for the fans located under the hood was blown. After replacing it, the fans worked as they should, my car runs cooler and the engine service engine light is now out. Of course there are many possible reasons why the service engine light may come on including problems with the car's emissions. A reputable mechanic can solve your problem.

Posted on Apr 09, 2009

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nampaboat

nampaboat

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SOURCE: 2004 gmc sierra ext cab

Your vehicle does two types of evaporative leak detections by the on board diagnostics. Depending on the test your a getting a gross leak detection fault this is usually caused by a faulty fuel cap that is not holding the vapor in the tank. The tests have to be done under set conditions so the problem will only occur when the test is commanded and the test fails. You will get the fuel cap then the check engine light.

Posted on Feb 17, 2011

billy bob

  • 47 Answers

SOURCE: Tighten gas cap and then

Doesn't completely sound like a fuel pump problem...sounds like a vacuum line problem .... check your pcv ...and vacuum lines and when was your fuel filter last changed and how many miles are on the car...your fuel pressure regulator solenoid needs to be dry on the vacuum side too...diaphram could be leaking but if you can't find an obvious problem I would definiately find a qualified mechanic to dive into it...do you have access to a scan tool to read the trouble codes?

Posted on Jun 03, 2011

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How to reset Service Engine Soon light after replacing gas cap? Took to AutoZone when the Service Engine Soon light came on Error code P0440.


Disconnect the negative battery cable for 30 minutes. Reconnect after and the code will clear. However if the problem persists, the code will come back with in 20 miles or 30 minutes.

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Check engine light went on Monday evening when I started my 2004 Hyundai Elantra. I shut it off and tightened the gas cap. That didn't work. It is still on as of Tuesday afternoon.


The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.

When the Check Engine light (or Service Engine Soon) is turned on, the systems computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible system faults (the gas cap is just one of them) that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen/Oriley and Autozone parts stores (USA only) do this testing for free.

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1 Answer

Tighten gas cap and then service engine soon lit. Replaced with factory new cap and reset service engine soon light by disc negative battery lead. about 2 drives later the tighten gas cap lit again then...


Doesn't completely sound like a fuel pump problem...sounds like a vacuum line problem .... check your pcv ...and vacuum lines and when was your fuel filter last changed and how many miles are on the car...your fuel pressure regulator solenoid needs to be dry on the vacuum side too...diaphram could be leaking but if you can't find an obvious problem I would definiately find a qualified mechanic to dive into it...do you have access to a scan tool to read the trouble codes?

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Check fuel cap light came on after filling with super unleaded gas then soon after service engine soon light came on what can i do?


the cap most likely set an evap code in the computer have it checked with a scan tool.if the cap is on tight then just clear the code and the light will go out.

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should have two lights check engine and service engine soon.check engine means there is a malfunction.service soon is reprogrammable,when you change you oil. check you owners manual for reset.

I’m happy to help further over the phone at https://www.6ya.com/expert/kenneth_3efc1f8510674f04

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I just put in new fron pads in my 2000 buick century and the track off and the anti lock brake light and the service engine soon stays on

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On a 2002 Buick Century with 3.1 liter motor. "service engine soon" light remains lit. Last week it was the "low coolant" Light that stayed lit. Had a new coolant sensor installed and problem still...


No you need to have the vehicle scanned for the check engine light to see what the code is that has it on. Autozone will do this for free.

May 17, 2010 | 2002 Buick Century

1 Answer

2004 Buick LaSabre engine service light is on and dealer and autozone says it is a loose gas cap but it is not loose. What do I do?


The cap might need a pressure check. Just because it stays on and tight doesn't mean it is functioning properly. It must meet EPA standards to function properly. Your cap is special part of your emission system and if it is not working properly you will need to replace it and have the light reset. If you owed a code reader it would tell you the same. Auto zone does do free code reading. The check engine light usually is not a big problem,but... I will leave it at that. 

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I have the same car and if the gas cap is loos for any reason the service engine light will come on so check that. If it is it will turn off in a few days after you tighten it.

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1 Answer

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take car to any local parts store and have them check for codes. or a auto repair shop or the dealer. i would take to local parts store cause they will do it for free and give you the codes and tell you what they mean

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