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My check engin light came on i had it put on the computer it that the cap has a air or the line has a leak some where

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Get a new gas cap.

Posted on Apr 14, 2015

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My check engin light keeps coming on i had it check they it could be the fuel cap took cap off put back light gose off i was that the line may have a leak


Fuel cap is part of the emission system. If is not put back on correctly your light will come on. Removing and installing correctly will cause the light to go off. Make sure cap is secure each time you fuel up. See if that ends the problem. If not try a new cap.

Apr 03, 2015 | Dodge Durango Cars & Trucks

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Fix your gas cap so the check engine light stops coming on for $1


If you own a newer car and your check engine light is on because of a slow leak in the EVAP circut, and you want to try a quick fix before you buy a new gas cap, try taking the cap off (while the engine is off, otherwise it will set the check engine light on again) and put some vaseline around the rubber seal that contacts the filler neck. After some time, the rubber loses its flexibility and wont conform to the surface as well and the vaseline helps it to soften a little and seal up the minute air leaks

on Feb 09, 2010 | Dodge Ram 1500 Cars & Trucks

2 Answers

Obd code p0457 fuel cap replaced mil reset defect not cleared connection checked ok


The code is for a large leak in the EVAP system such as a loose or missing gas cap. But it could also mean a loose or missing hose to the canister or other leak in the tank.
The computer vents the tank several times an hour while the engine is running, and it checks the system by pressurizing the gas tank. If the tank will not hold pressure the code is set.
You may have to check the top of the tank where the fuel pump gasket is, as well as the vent lines to the front of the car.
A mechanic would perform a smoke test to look for leaks.

Jul 23, 2012 | Honda Accord Cars & Trucks

1 Answer

I have a 2001 Jetta and the check engine light has been on for a while but the car runs completely fine. I tested it and got 2 codes which are po412 (secondary air injection system switching valve A...


The P0412 code sounds like an electrical concern for one of the air injection valves. That may require some diagnosis that a reputable shop can provide.

As far as the P0455 goes, you may be able to remedy that yourself- is the gas cap loose or incorrectly seated? If the gas cap is seated and clicked all the way on and the rubber seal on the underside of the cap is not cracking, there may be a line disconnected somewhere, or a failing vent.

Also note- if the gas cap IS loose, and is the reason the 'check engine' light came on, tightening the cap won't turn the light off immediately. The vehicle's on board computer needs to run its normal test on the EVAP system and verify there is no longer a leak. This kind of test is run by the on-board computer while you're driving. If it sees that the leak is no longer present, the light will turn off by itself. It could take one day or even one month before the light goes out depending on how much you drive. Or you could clear the code if you have a code reader or a scan tool.

Aug 08, 2011 | Volkswagen Jetta Cars & Trucks

2 Answers

I have a 2006 Ford Taurus SEL and my gas cap light came on followed by my check engine light within 2 days time. The car seems to be running fine...is this a situation where I just need to replace my gas...


Not necessarily. If you get a scan of the system, you will probably see the computer has set trouble code P0455. This can be a large leak anywhere in the evaporative emissions system. The gas cap is always the first place to look. If the cap is loose, there's your problem. If not loose, look over the seal and also the inlet pipe to see if it looks like it could be leaking evaporation gasses. If in doubt, replace the cap.
If there was no problem there or if you put a new cap on and the light stays on for days afterward, start looking for another leak. There is a vent line coming off the fuel pump along with the fuel lines. It is usually connected with a short rubber hose to the pump assembly. make sure that hose isn't leaking. Then follow the vent line to the evaporation cannister. Check all hoses at the cannister and the cannister itself for damage. Then follow the other lines from the cannister. You should encounter the vent valve along the way. Make sure the vent valve isn't stuck open or leaking. Well, that's the whole system except for the part that sets the code. There is a little pump somewhere that pressurizes the system to check for leaks. Make sure that thing's hoses are good too. At this point, you should have found the leak. If you have any questions, please let me know.

Nov 02, 2010 | 2006 Ford Taurus

2 Answers

Dodge grand caravan 2002 se check engine light on. this is the only problem fail inspection. Vehicle run good.


There are so many things that cause a check engine light ot come on that its almost impossible to tell you how to fix it. If you can stop by an Autozone or Advance auto parts store they will usually put a code tester on your car and get the error codes stored in your cars computer. In a lot of cases there are vacuum leaks. Vacuum lines become brittle and crack letting excell air into your intake system. If your gas cap gasket is worn, same thing. You also have a catalytic converter that may be clogged up as well as orygen sensors in the exhaust system that may have failed. There is an exhaust gas recirculator that opens when the computer calls for exhaust gas, as well as a positive crankcase ventilator that may be stopped up. Check engine lights are just an indicator that one or more of these things have quit working.

Sep 20, 2010 | Dodge Caravan Cars & Trucks

1 Answer

My 2002 Cadillac Service Engine Light came on, code scanned for Catalytic converter. I replaced the converter after 2 weeks light came back on as well as alerts foe check gas cap, and check coolant level....


the code for gas cap? is also a code for small leak in evap system which includes the fuel /vent lines and canister check that the lines weren't damaged when cat was put in also check coolant sensor in reservoir connections runs by exhaust system

Nov 01, 2009 | 2002 Cadillac Deville

2 Answers

Check engine light on says check gas cap. Is it the cap or a sensor?


The evaporative emissions system uses a vaccuum pump to check the fuel system to make sure that fuel vapors cannot escape into the atmosphere. If you leave fuel cap loose the computer will detect it and set a computer code and turn on the check engine light. If the cap is tight and the light still comes on, you may have other problems. Hopefully your vehicle is still under warranty, as evaporative emission system leaks can be very difficult to locate and repair, even for the dealership mechanics.

Aug 28, 2009 | Chevrolet Cobalt Cars & Trucks

2 Answers

Check Engine Light Stays On


bad gas cap
O2 sensor bad
also could be a bad air valve or air line leak

Apr 10, 2009 | 2006 Dodge Caravan

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