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Old 06-16-2010, 07:58 AM   #1
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Weird Check Engine Light Issue

For the past few weeks I would start my jeep and the check engine light would be on for the entire trip for a few days. And then it would go off for a few days, and then back on a few days again over and over again.

I have tried several times with the turning the key on and off 3 times, but it never returns any error codes.

Anyone have any thoughts on a good next step?


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Old 06-16-2010, 08:22 AM   #2
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What year do you have? Not all years/models are readable with the key. If yours is, then you have to check the code while the light is still on. Mine does that same thing in the cooler months. Light comes on and then goes back out after a few starts. Mine is a slow response on one of the 02 sensors but it is not a code that the computer stores, so once it goes out, it cannot be read. Just fyi, I have never had it serviced for this code or reset and it passes emissions.

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Old 06-16-2010, 09:07 AM   #3
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I have a 99, 4 cylinder, 5 speed. I have tried it while the light is on, and still nothing.
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Old 06-16-2010, 09:32 AM   #4
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when was the last tune-up? Air filter, spark plugs, oil change, etc... ??? if its been awhile, start there. Those parts are designed to wear out.

Also, let us know if anything strange happened before it started doing this such as being under water, overheating, teenager was trying to learn to drive a stick etc...
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Old 06-16-2010, 09:44 AM   #5
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Not to insult your intelligence, but have you un-hooked your battery to see if it clears the engine light?
I'd do all the free stuff you can first, before spending any money.

Also, make sure your gas cap is tight and secure. My intelligence fell by the wayside a couple weeks ago when I left my gas cap completely off and my check engine light came on. I was freaked out and parked the jeep and drove my truck to work. Later on, my wife called me and told me my gas cap was hanging from the tether.
At some point during jeep ownership, you will BUST A NUT!!!
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Old 06-16-2010, 09:45 AM   #6
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Next time you drive past AutoZone or a similar place, ahve them run a free code check for you to see if anything comes up.
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Old 06-16-2010, 10:06 AM   #7
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It's probably your O2 sensor. Mine does the same thing.
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Old 06-17-2010, 03:04 PM   #8
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Yes, I have unhooked the battery overnight, didn't do anything. I did a tune up after the light started coming on and going off, and it didn't make any difference. I've also checked the gas cap, nice and tight.

Thx for all the great suggestions!
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Old 06-17-2010, 05:54 PM   #9
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I have an 05 with the six cylinder. It is mainly a beach Jeep. When I drive it on hard packed sand for a couple of miles the check engine light comes on and the error reads something like "Panel Open". After I leave the beach and drive it on the highway for 50 or 100 miles, the light goes out. It never seems to effect anything so I don't worry much about it anymore.
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Old 06-17-2010, 07:04 PM   #10
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Mine has been doing this lateley as well. mine is the TPS though.. hasent done it in a couple days though. When you switched the key on and off 3 times did you leave the key in the on posistion when you cycled iot the last time?

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