Question about 2001 Ford Focus

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Check fuel cap light stays on a's does engine light

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Take off the cap and clean the gasket and the edge of the fill tube. maybe dusty and not making a good seal

Posted on Oct 09, 2010

  • ba0067 Oct 09, 2010

    Thanks, I've already done that a few times and it keeps happening.

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Posted on Jan 02, 2017

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Why would my OBD or malfunction indicator light come on and stay on?


Check engine light comes on with faulty oxygen sensor, loose gas cap or faulty gas cap. sometimes with low octane fuel as well. fill up with high octane fuel, tighten down the cap and see if it helps.

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Check engine light came on and code said to replace gas cap, did that and two weeks later check engine came on same code, then one day fuel light came on and gauge went to fueull then empty 2 times , now...


You wouldn't think a gas cap would be that important, but it is. When it's loose or cracked, fuel vapors leak out and can throw the whole fuel system off. This causes a reduction in gas mileage and increases emissions.
What causes it: If you get an error pointing to the gas cap it means fuel vapors are leaking out of your cap. This means the cap is either cracked or just wasn't tightened well enough.
What you should do: If your car isn't feeling jerky or strange when the check engine light comes on the first you should check is the gas cap. Pull over, retighten it, and take a look at the cap to see if it has any cracks in it. Continue driving and see if the check engine light turns off. Alternately, you can purchase a gas cap for about $3 at an auto parts store. All you need to do is take the old one off and screw on the new one. If you've already made it to the store, you might as well just replace it. While not car-threatening, it's good to take care of this right away to improve gas mileage.

Aug 11, 2017 | 2004 Chrysler Pacifica

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My check engine light came on code P0446; dashboard says "check gas cap" i took it off retightened it and check engine light still on. I noticed that the metal flap for the gas nozzle is...


The metal flap should not trigger the sensor. Once you tighten the gas cap you should clear the code and see if it comes back. Otherwise it will take a while to go away.
If it does come back even though the gas cap is tight it could be the rubber seal around the gas cap replacing that can sometimes fix this issue also.

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1 Answer

Ran out of gas recently. when refueled and started again,check engine symbol stayed on? well mainted and has always ran great since new.


Sometimes the check engine light will come on if the fuel cap is not on tight enough. Check the fuel cap for an intact seal and install at correct tightness.

A major auto parts store will read out the stored trouble code in the car's computer for free. If the code pertains to the fuel EVAP system, the code probably set because you ran out of gas. Copy down the code and then have it erased. The check engine light should go out. If it comes on again, have the code read and the problem checked out.

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You can dis connect the battery for an hour or 2 and rehook it if the code is not active then the light will stay out

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Ford Mustang service engine soon and check fuel cap lights are on


Check fuel cap light will not immediatly go out upon replacement of the fuel cap. Might take several days. You could go to a local autoparts store and have them read the trouble code (for check engine light) and reset it. If it was indeed the fuel cap the light should stay off after resetting it. Most autoparts stores do not charge a fee to do this.

Oct 23, 2009 | 2001 Ford Mustang

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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