Question about 1994 Ford Thunderbird

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My check engine light is on.

I made sure cap is on tight, but light is on. Need new gas cap?

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Yes gas cap can be bad its worth a try

Posted on Feb 18, 2009

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2 Answers

My check gas cap light is on is this an electrical problem or do I need a new gas cap


Try to change the gas cap first if that doesnt work check ur fuses then if still not fixed its definitely electrical

May 28, 2014 | 2003 Ford Focus

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Engine light,


99% of the time, the gas cap wasn't tightened properly, or is leaking. Make sure you twist it tight and it clicks a few times. If the "Check Engine" light stays on after a few days, buy a new gas cap. Again it may take a few days to clear.

Jun 14, 2012 | 2002 Dodge Grand Caravan

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Got scan problem numbr P0442 Check engine is


Po442 is an evap leak, this is the fumes from the gas tank, check vacuum lines from engine compartment for any cracks or splits also make sure gas cap is tight and gasket is good, most of the time this is caused from a bad fuel cap, i would replace the gas cap make sure its on tight then drive for a week if the light goes out then problem solved if light is still on after a week of driving then there a leak is the system. hope this helps.

Aug 30, 2010 | 2005 Dodge Grand Caravan

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Check Gas Cap alarm comes on and engine light is on


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.

Jun 16, 2010 | 2004 Pontiac Grand Prix

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My engine light and gas cap lights are on, what do I need to do ?


Make sure the gas cap is on tight.
Disconnect the battery for a couple mins, to turn off check light.
If it comes back,you need to check for codes,by hooking a code reader or scanner under the dash.
Most likely a bad gas cap. Do not replace without an Emissions Code for it

May 03, 2010 | 2003 Ford Escape

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Why check engine light come on mostly after refuiling after a long drive ?


Because your vehicle is a 2008 I feel it shouldn't be anything to pressing but still take some precautions.

What alot of people don't know is sometimes if the gas cap is not put on tight enough a little air might get in or your gas pump might have to work a little harder because it can't get full vacuum pressure with the cap slightly open. these are not major issues.

these are reasons why your check engine light comes on. It happened to my 2005 Buick Rendezvou We had the check engine light on for a week. The car never shuttered, stalled, delayed starts it ran perfectly fine. I took it in to check engine light their computer showed that it was the EVAP system which is the heating and cooling system I would have to get it checked for leaks or do a static check for leaks.

This didn't look good but then one day I had done some work for a friend told him of my problem he told me it could be my gas cap. The next day I asked my wife if the gas cap was working on vehicle it actually was broke I replaced gas cap and the check engine light came off.

Now with this story (which is true) don't assume every problem could be this. But if you are not noticing any stalls, delayed starts, shuttering anything out of the ordinary check the cap at times to make sure it is closed.

If you keep on having light on and replaced cap or made sure was securely on then take and get it checked out.

merry christmas

Dec 25, 2009 | 2008 Hyundai Accent

2 Answers

2005 check engine light comes on. had advanced


If the light is out, no worries. if it comes back on and the cap is tight, there may be other problems and a qualified repair shop will need to diagnose that for you. It may have a Evaporative Emission Leak.

Nov 10, 2009 | Chevrolet Cavalier Cars & Trucks

1 Answer

Fuel/gas cap


have you replaced the gas cap? most of the time when a check engine light is on for the gas cap, its because the cap isnt venting the fumes properly or the cap isnt on tight enough.

Jul 16, 2008 | 1999 GMC Denali

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