Question about 2003 Pontiac Sunfire

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Engine light stays on,replaced fuel cap per auto parts store.still light stays on,also fog lights dont work but car runs good

Also checked fuses no luck

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  • Pontiac Master
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Have pcm code retrieve first

Posted on Mar 24, 2014

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You cannot make the check engine light go off by replacing or removing a fuse. You need to fix the problem that is causing the light to come on. It might be as simple as replacing the gas cap. I would take the car to AutoZone or another auto parts store and have the trouble codes read. The store will usually give you a printout of possible problems associated with the code(s). If you want to spend the money you could buy a code reader and read the codes and then clear the codes which will cause the check engine light to go off for a short time (maybe long enough to get theemission test done if you're lucky!).

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Service engine light stays on car runs good replaced gas cap per parts store what else could it be?


Well, don't guess at it like that, get a readout of the trouble code stored in the car's ECU. Any auto mech can do this for you, and in the USA Autozone as well.

You will find a code like P0135 or some such, and this will have a meaning specific to your car, so you can home in on the fault.

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In the engine compartment fuse box, check the 20A DRL, FOG, HORNS FUSE and confirm that the FOG LAMPS RELAY is in place. Fog lamp operation depends upon the DRL setting so the DRL circuit may be defective which would account for the headlight problems.

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You have to proper test any vehicle systems that apear
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Once all the answers are present, only then do parts get
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Things such as fuses & relays only fail here on these web site
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From what I see on this site from people asking questions,
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The check engine light can be anything, in order to help you further you need to get the codes out of the computer. to do this you need to either A. Buy a cheap code reader from an auto parts store, B. Go to an auto parts store like Advance, or Autozone or pep boys, and they Usually will read the codes for you for free. Then you need to post back here with the code read, and We can help further

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And yes the loose fuel cap may cause the light. If you have more than 60,000 miles on your car, it may require some tune up parts such as oxygen sensors and such. CHECK YOUR WARRANTY!!! most states require the manufacturer to replace the emission related parts at mileages of 100,000 or even 150,000 so dont buy something you could get for free!

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1 Answer

Check fuel cap light


Good Day,

Probably just a bad seal in the cap. You can purchase a new one from any auto parts store or dealer. Just make sure they cross-refrence the new cap to your car as diffrent caps have diffrent pressure ratings, and you wanna make sure you get the right one. And yes a faulty cap can cause your check engine light to come on as the fuel is not pressurized properly for the motor. Once the cap is replaced with a new one remove your negative battery terminal for a few moments, then re-connect this will clear you check engine light. If you don't do this you engine light will stay on forever.

Good Luck
Hope this helps

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