Question about 2009 Ford Mustang

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Loose cap light on

Light came on but i checked and the cap and cap was tight.

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Posted on Jan 02, 2017

SOURCE: Check Engine Light appeared; diagnostics resulted in PO455 code

If you Googled the code, you would find you
have an Evap System Gross Leak

If the gas cap was just loose the light will go out

The evap monitor only runs every few days,so
you may have to wait & see

I think you need to smoke the system & find the
route cause,vent solenoid,pressure solenoid,etc

Posted on Apr 05, 2013

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Engine light on, took to dealer they did a smoke test found out gas cap po442. know 3wks later back on check cap loose again .need a new cap or is it something else. denice


You said nothing about model, make, or year of vehicle, but on most vehicles, you have to turn the gas cap tightly until it clicks a couple of times when putting it on. If you only turn it (lightly) until it stops moving, it can work itself loose. If you are turning it until it clicks and it comes loose, you should replace the gas cap.

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The loose gas cap can mess with your vacuum system but a check engine light means check your computers error messages. Have a mechanic do so before we speculate too far.

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If the code would have been due to the cap problem then the code will go away. Try resetting the code. Also try diagnosing again after disconnecting the battery and then reconnecting it after a few minutes.

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Check engine light comes on after fueling 5 series BMW


Hi and welcome to FixYa!

As a first course of action, I strongly suggest that you tighten the gas cap. It may be a little loose that's why the engine light is on.

Hope this helps and thank you for using FixYa! Have a good one!

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P1456


code P1456 set when there's small leak in the fuel tank system.
Most known reason for P1456:
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-or a bad gas cap.
I'll try tighting the gas cap.
clear check engine.
if code come back, replace gas cap and clear check engine light again.

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You gas cap is not on tight enough to seal causing the Check Engine Light to come on. When you tighten your gas cap you need to tighten it until it clicks at least 5 times, if it is tight than the seal on the gas cap may be bad. Replace with a OEM GM gas cap or a quality replacement that meets OEM specs.

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A loose gas cap will set the check engine light.Make sure the cap is tight,get the codes read if this is not the case.

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Engine light came on said purge flow senser or evap canister


Your evaporitive emission system has failed. The code indicates a fuel vapor leak in the purge system.
This can be caused by a loose gas cap to a damaged vacuum hose or regulating component.
Check the gas cap first, make certain the cap is tight and the seal on the cap is in good condition, no tears or damage. Check the fuel filler pipe for knicks and dents.
If the cap was loose, the light will not clear until the next cold start, that is when the engine computer runs the test.
Good luck, let me know.
Regards,

Jun 30, 2009 | Hyundai Motor 2004 Sonata

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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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