Anyone have any gas cap sensor problems? - Page 2 -
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post #16 of 22 Old 07-01-2014, 10:14 AM
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2009 YJ Wrangler 
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Sensor & gas cap

I have a 2009 Jeep Wrangler with 50k miles. My sensor came on Friday morning. The manual indicated it could be the gas cap or bad gas. I was down to about 1/2 tank of gas, so I had not just filled. I decided to try the gas cap. Bought a new gas cap from AutoZone on my lunch Friday. The sensor went off on Sunday, but then "gas cap" dinged at me. I pushed the trip to turn it off. On Monday I took it to get an oil change they hooked it to the diagnostic and it was the battery. Replaced the battery and everything is fine. Put my old gas cap on and no problems since. I guess I thought if it were the battery, the battery light would come on. But that was my fix. Good luck and have your battery checked if this happens to you.

Last edited by ginalong1; 07-01-2014 at 10:30 AM.
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post #17 of 22 Old 07-02-2014, 10:19 AM
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2007 JK Wrangler 
Join Date: Sep 2013
Location: Thunder Bay
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Yes. When my battery started leaking, my gascap light and occasionally my engine light would light up a couple of minutes after driving if it had been raining or was very humid. A new battery solved the problem.

(This being different from the time when my gascap light turning on was due to a squished and dried out O-ring on the gas cap and a bit at the top of the filler tube.)
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post #18 of 22 Old 07-02-2014, 02:40 PM
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that problem happens because of the gas tank
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post #19 of 22 Old 07-03-2014, 11:02 AM
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Awww!! This just happened to me this week. Gascap light came on and now check engine light is on.

What part was replaced and where on the evaporator canister?

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post #20 of 22 Old 07-03-2014, 12:35 PM
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2011 JK Wrangler 
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Location: west monroe
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gas cap light.

i dont see how a battery has any affect on the emissions system or sensor. Mine has been on for months. we reset it it came back on. I bought an after market gas cap. they said after a few dozen starts the sensor would reset itself if the gas cap was the issue. It didnt reset. I said to hell with it cause we do not do emissions tests in La. but then I started to notice a 1 to 2 mile loss in my gas mileage! Now that sux cause its not that great on a good day. JS so as it happened my battery went dead. I put new battery in. this automatically reset the sensor. a week later the damn this is on again! so battery is ruled out. I also would like to know more on the evap cap and canister. Thanks.
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post #21 of 22 Old 07-03-2014, 02:55 PM
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The white thing attached to the evap is the leak detection pump. I guess it is possible for it to go bad and that would throw a code I would think but there is a little rubber seal between the leak detection pump and the evap and that seal does go bad and it will create a small leak. The dealer should have the seal and they are only like 2 bucks. The pump is only like 10 bucks.

If you have the gas cap warning I would think bad gas cap first then consider the seal on the pump.
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post #22 of 22 Old 07-04-2014, 10:08 PM
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Thank you.
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