Question about 2002 Buick Century

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Service soon light on, code says emmission problem. bought a gas cap and do we drive it for 100 miles and it will turn off itself?

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Posted on Jan 02, 2017

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SOURCE: Service engine soon light

You need to have the vehicle scanned or pull the code out with a code reader,and address/fix the code.If you do not repair the problem,you can clear the code,but the service engine light will come right back on.To clear the code,you can disconnect the negative terminal on the battery for at least 20 minutes,then reconnect the battery,but the car is going to be hard to get to idle,because sometimes the computer has to relearn how to idle the engine without stalling.Good luck.

Posted on Jul 10, 2008

  • 491 Answers

SOURCE: "Service engine soon" light

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

Posted on Oct 18, 2008

  • 67 Answers

SOURCE: code displays po440 ;i've replaced evap cannister

your local dealer can perform a smoke test to test your evap system for leaks

Posted on Nov 12, 2009

  • 193 Answers

SOURCE: service engine soon light on

That light indicates a malfunction if the computerized engine management system (fuel injection, spark, cooling system). There are literaly dozens of things that can cause the light to come on. You will need to take it somewhere and get the code that caused the light to come on. Then we can help you find the problem. Some of the auto parts chains (AutoZone, O'Reilly's, Advance, etc.) will get the code for you at no charge. Then repost your problem and include the trouble code.

Posted on Feb 24, 2010

  • 2309 Answers


the eec is the sensor for the evap system, either the gas cap is leakin or one of the hoses, the system is made to keep the gas tank at minus 1 lbs pressure, anything that disrupts this will send a message, could also be the fuel tank itself

Posted on May 26, 2010

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Check the gas cap and make sure it is tight, if cross threaded or the seal is bad the light will kick on. Hope this helps.

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you will need to scan the computer for codes and post them in the comments below. Your local dealer or repair shop will do this, there is usually a charge, you local parts store may do this for free. You can buy a basic code reader for about $50-$100 (US) and do it your self.

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whenever the computer sees a problem it stores a code, this code will tell you where the problem is, this cant be major its only got 43k on it, check your gas cap and make sure its tight, a loose or missing gas cap will turn the light on, if its loose tighten it and drive for a week and it will reset if it tight then go to an autopart store many of them scan the compuetr for free and give you the cide or codes , also one more thing, this is a federal law that dealers must warranty certian emmission control parts for 8 years or 80,000 miles, so if the code is something like an o2 sensor thats warranty part, hope this helps.

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On my 2005 Mazda 6, my engine light is on and the diagnostic code says it's the gas cap..How to I turn the check engine light off

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My service soon light came on and the message "service emissions". What is the most likely problem

hard to know if you dont have a scanner to read code. i would suggest making sure gas cap is on tightly this in the number one problem that makes these lights come could be anumber of things these are emmission related problems for light o2 sensor,clogged catalytic convertor,car may need tune up.change oil,fluid levels,spark plugs,air filter.fuel filter idle air control valve and the list goes on but make sure gas cap is on tight and drive for a couple of miles and see if it turns off..

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My check engine light came on and when i pushed my onstar button it said something about my gas cap. do you know what it may be? i did just put a locking one on my car

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I'm not a mechanic but I've had this problem with a dodge truck and a Saturn. I bought a new gas cap and the problem stopped. It takes awhile after you install the new cap for the emmission control system to clear. Something about air gas mix. I don't know about the Trac problem.

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