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Old 01-09-2014, 05:25 PM   #1
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2001 Jeep wrangler sport check engine light?

Howdy Y'all I need help figuring out why my engine light keeps going on. I only have 40k original miles. It doesn't run funny, or problem starting or leaking any fluids or anything. I keep disconnecting battery and the light stays off for a week then comes back on.

I was wondering if it is the catalytic? There is no loss in hp or overheat. But if it's cold it will idle a little rough for a few seconds but then idle fine.

It has a jet chip and larger throttle body and k&n fipkit but everything else is stock. Anyone had problems with jet chips going bad, or maybe it forces so much air in the engine but is getting bottled up in the exhaust and causing the catalytic to go bad? IDK

Anyone who can help me is much appreciated. I live in a very rural area and don't know any place I can do a diagnostic on it. Thanks

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Old 01-09-2014, 05:34 PM   #2
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Find out the code associated with the check engine light then maybe someone can give useful help

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Old 01-09-2014, 05:41 PM   #3
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Thanks Digger84 I guess I'm going to have to find some where to take it.
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Old 01-09-2014, 05:59 PM   #4
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I have a '04 that does the same thing. Jeep dealer checked and mine is a small vapor leak. It is not a big deal, maybe someday I'll have it fixed. Another associated vapor thing, if your gascap is old or a little loose, same error happens. Just my 2 cents.
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Old 01-09-2014, 06:15 PM   #5
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Most years you can cycle key and code will display or most auto part stores will scan codes for free

If check engine light is on one or more codes was/were set so find code and report back
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Old 01-10-2014, 12:54 AM   #6
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Thanks guys for all your help. I found an advanced auto thirty miles away that said they will check the code. I will let you know what error code it is tomorrow night. It has me stumped for sure, everything seems fine.
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Old 01-10-2014, 02:44 AM   #7
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You can check the code yourself. Your jeep will display the engine code in your instrument cluster, no need to drive 30 miles.
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Old 01-10-2014, 09:04 AM   #8
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As mentioned, just get the code yourself then google said code(s) or post them here to find what they are.
To get the codes, turn key to On (not start) Off, On Off, On.
Leaving in the ON position the for the third time, it will cycle through the codes.
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Old 01-11-2014, 08:27 AM   #9
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You guys are all genious! Thanks so much for the help. The key cycle code does work, I never knew you could do that ! Saved me a 60mi round trip.

Ok so the code is P0455 which is large emissions leak. I have a after market stant lockable gas cap that I put on yrs ago when I first bought my jeep, so it says to start there. Thats a good place to start anyway. I have tried tightening it before a few times so maybe the gasket is just shot or maybe it's a hose. I will keep you guys informed of the outcome.

Thanks again for all your wisdom I really appreciate it!
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Old 01-11-2014, 08:35 AM   #10
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You guys are all genious! Thanks so much for the help. The key cycle code does work, I never knew you could do that ! Saved me a 60mi round trip.

Ok so the code is P0455 which is large emissions leak. I have a after market stant lockable gas cap that I put on yrs ago when I first bought my jeep, so it says to start there. Thats a good place to start anyway. I have tried tightening it before a few times so maybe the gasket is just shot or maybe it's a hose. I will keep you guys informed of the outcome.

Thanks again for all your wisdom I really appreciate it!
Personally I would replace the cap with one from the dealer. Auto Part store caps are know to be not very well made because they come from China.
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Old 01-11-2014, 09:00 AM   #11
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Thanks ATTHEHOP I was thinking the same thing. I wasn't impressed with the lock on that cap either it was always stubborn.
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Old 01-11-2014, 06:39 PM   #12
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Well I put an oem gas cap on and light is still on. Every hose I tried to order and even fuel filter says unservicable at O'reillys auto. They can't even order one. He says maybe they changed the design in the later TJ so they don't carry the part. I guess I have to go through mopar.
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Old 01-11-2014, 06:45 PM   #13
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I went to 002 and they gave me a STANT gas cap. Fixed my CEL emissions leak. Couldn't speak any more highly of them.
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Old 01-11-2014, 07:37 PM   #14
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Well I put an oem gas cap on and light is still on. Every hose I tried to order and even fuel filter says unservicable at O'reillys auto. They can't even order one. He says maybe they changed the design in the later TJ so they don't carry the part. I guess I have to go through mopar.
Fixing the problem does not clear the codes instantly so if indeed the issue was resolved it may take several cycles for the CEL to go out.
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Old 01-11-2014, 07:49 PM   #15
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Fixing the problem does not clear the codes instantly so if indeed the issue was resolved it may take several cycles for the CEL to go out.
x2
If it is the gas cap, could take up to a week to go off, or your could disconnect the battery again.
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Old 01-11-2014, 07:58 PM   #16
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x2 If it is the gas cap, could take up to a week to go off, or your could disconnect the battery again.
X3 I didn't even know codes clear themselves. I unhook the battery. I wait a long time because I over do stuff. Heard it takes as little as 10 min.
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Old 01-11-2014, 08:48 PM   #17
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As mentioned, just get the code yourself then google said code(s) or post them here to find what they are.
To get the codes, turn key to On (not start) Off, On Off, On.
Leaving in the ON position the for the third time, it will cycle through the codes.
And then how do you erase codes? If they give you the ability to read them there must also be a way to erase them. Disconnecting the battery to erase them is inelegant.
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Old 01-11-2014, 08:48 PM   #18
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I went to 002 and they gave me a STANT gas cap. Fixed my CEL emissions leak. Couldn't speak any more highly of them.
I've had a locking Stant on mine for 13 years. Love it. Has a pivoting metal cover to keep freezing rain out of the key hole too. I don't think a Stant gas cap is your problem but then again I love them.
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Old 01-11-2014, 08:50 PM   #19
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And then how do you erase codes? If they give you the ability to read them there must also be a way to erase them. Disconnecting the battery to erase them is inelegant.
Umm you un hook the battery. Think it was said a few times above lol! don't have to be elegant. Ever wore cover alls? Should make it so you open and close the door real fast to clear codes!
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Old 01-11-2014, 10:45 PM   #20
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No, seriously, how are you supposed to erase the codes? It's OK to say you don't know.
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Old 01-11-2014, 10:56 PM   #21
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To erase the DTCs (diagnostic trouble codes), you either need a scan tool, or you can disconnect the negative battery cable. You can check the codes on some years with the key cycle trick but there's no trick to erasing them other than doing the above.
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Old 01-11-2014, 11:18 PM   #22
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No, seriously, how are you supposed to erase the codes? It's OK to say you don't know.
First I put on a too too. Then I grab a fairy wand and do a dance. Then I sprinkle magic dust. Then I pray. Then I unhook the battery.
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Old 01-12-2014, 10:18 AM   #23
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It's possible that nobody around here knows how to do it but there's a way to delete codes with the ignition key system. Nobody builds a code reading system without a means of deleting.
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Old 01-12-2014, 02:44 PM   #24
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It's possible that nobody around here knows how to do it but there's a way to delete codes with the ignition key system. Nobody builds a code reading system without a means of deleting.
Well when you figure it out, you let us all know but to my knowledge you need a scan tool or that too too dance that was previously mentioned (the battery cable) lol. But hey after all, what do I know. I'm just an auto technician whose certifications include engine repair and engine performance which often deals with diagnosing check engine lights lol.
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Old 01-13-2014, 08:28 AM   #25
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They are right 03 TJX. As inelegant as it is, its either the scanning tool or the battery being unhooked.
They made a lot of cool things with the key, like holding in the trip button while turning the key to on, No faults is displayed, let go and it will do a light/gauge check on your entire cluster. Very cool, slick, elegant. Sadly, I guess their great ideas with the key ended there.
That's not to say there is NO way of doing it, just that non of us have ever come across it nor heard about it. And as suggested, if you find a way, clue us in! We like to disconnect the battery just as little as anyone.
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Old 01-13-2014, 11:46 PM   #26
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But it's originally an OBDI system. There was no such thing as an OBDII scanner when it was developed. OBDI systems always had a delete code feature. It's buried somewhere in an old Jeep service bulletin.
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Old 01-14-2014, 08:35 AM   #27
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I'm going to post pics in a few minutes of what I found to be the cause of the p0455 code. It wasn't the gas cap because I reset it by disconnecting the battery and sure enough in a couple of days it displayed the same code. I went real redneck on it and whipped out the camo duct tape to see if the hoses I thought were the problem really were the problem instead of running 60 miles to swap out parts and it worked no more error code. I will post the pics so you all can see and maybe it will help someone else out.
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Old 01-14-2014, 09:16 AM   #28
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These two bigger hoses that no one knows the name of.

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Old 01-14-2014, 09:17 AM   #29
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Old 01-14-2014, 09:18 AM   #30
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catalytic converter , check engine light , jet chip

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