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Old 09-26-2010, 11:18 PM   #1
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"Check Engine Light"

Noobi here..

Looking to buy my first TJ Wrangler...a 01 with 59k miles.

The engine check Light is on...and the seller claims its from the gas cap-which - he replaced...but its still on..

My Dads 99 Chrysler 300 did the same thing-loose cap- engine light goes on for a fill up or two..

Same with the TJ?

What should I be looking for?

Tx,
Muddyspokes.

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Old 09-26-2010, 11:22 PM   #2
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Not sure if you can do it with an 01...but go test drive it again...and when you get in it, turn the ignition on, off, on, off, on...real fast. Don't start it during any of the "on" portions. On the third "on" leave it on...and it should spit out the trouble codes (P0***) and then say "done."

Then go look the codes up...if he's giving you a helluva deal, chances are it's nothing too difficult to fix. Typically a code for a bad gas cap is a "Large Evap Leak" or something along those lines.

Or get a mechanic to go with you and bring an OBDII code reader along...just pull the codes on the spot.

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Old 09-26-2010, 11:55 PM   #3
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my 02 wrangler is the same thing, its an evaporative emissions thing, the gas cap replacement is sometimes the easiest and cheapest fix, i was told that it is possible there is a bad computer that controls the emissions output and whatnot. im not to sure about it. but it is a pain the arse
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Old 09-26-2010, 11:59 PM   #4
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yeah i have a 04 TJ and mine does the same thing now and again. Its all good you have nothing to worry about.
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Old 09-27-2010, 12:21 AM   #5
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yeah i have a 04 TJ and mine does the same thing now and again. Its all good you have nothing to worry about.
Only if thats the reason the light is on in the first place! Take a code reader and get the codes off of it, that way you will be sure of what the problem is, don't trust the guy trying to sell his jeep, maybe he's looking for some fool to believe it's "just the gas cap".
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Old 09-27-2010, 12:22 AM   #6
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Be careful here. No need to mess around guessing or being taken advantage of by this seller.... just pull the code and see if it is a "Major Evac Leak". If it is, that does NOT prove that it is a gas cap. There can be other leaks that you will need to spend money to chase down and get fixed...some are not cheap fixes. Have the seller get it fixed and and the code cleared before you take it for a LONG test ride and before you buy it.
Remember... as the buyer, you are in the driver's seat on the sale...you must make the calls to protect yourself before the sale is done....don't give up that leverage without using it to your fair advantage...once you give the seller your money you got nothing but the thing you bought and if there is a surprise problem then you are screwed. The check engine light is going to cost someone to fix it...I don't care what the seller says but since the light is still on, he did not fix it.. PERIOD! Maybe it is the gas cap maybe not!

Becareful...protect yourself. Good luck buying your new TJ.
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Old 09-27-2010, 01:08 AM   #7
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I mentioned this in your "first new Jeep" thread. In California the seller will have to have the vehicle smog tested. If the CEL is on, it won't pass. No pass, no title transfer. So the seller should fix it if they want to sell it.
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Old 09-27-2010, 04:45 AM   #8
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I had the CEL on in my 04 TJ. Code was P0334 if i remember correctly. Suggested it was the emissions purge valve, but despite replacing it, light stayed on. The dealership had checked it out, cleared time and again and all they could suggest was replacing the computer..stuff that!
Ran fine still, only thing was when I'd fuel up, it'd cough n splutter when start again. This only lasted for a couple min then fine again.
Eventually I just cut out a section of plastic n put it behind the instrument panel so light was "off".
If I were you, I'd get one without anything "wrong".
Be patient, little things like that potentially become big things..
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Old 09-27-2010, 08:03 AM   #9
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Same problem on my 98 4.0 6cyl manual. just bought mine a month ago, light is intermittent , turned on a few times but then turned off right away, until yesterday, it's been on ever since, computer was reset a month ago and no monitors were closing, finally gotthe O2 sensor monitors to close but cat and evap won't close, I'm at the point where u think it's a bad computer or bad cat
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Old 09-27-2010, 08:27 AM   #10
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You'd think if it really was the gas cap, he'd replace it to prevent any issues the buyer might balk at.

Go with him to the smog station - it's HIS responsibility to have a clean smog test. They test the cap as well as everything else.
If a check engine light is on, they can't pass it. They will read the codes and tell you what it says, and most likely what it needs to fix it.

Be advised - if they or anybody clears the codes, a gas cap type code takes up to 50 miles to reset. If he clears them and tells you it's "fixed," it could be just another lie.

Take it to the smog station while the CEL is still on.
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Old 09-27-2010, 09:02 AM   #11
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Quote:
Originally Posted by Muddyspokes
Noobi here..

Looking to buy my first TJ Wrangler...a 01 with 59k miles.

The engine check Light is on...and the seller claims its from the gas cap-which - he replaced...but its still on..

My Dads 99 Chrysler 300 did the same thing-loose cap- engine light goes on for a fill up or two..

Same with the TJ?

What should I be looking for?

Tx,
Muddyspokes.
Disconnect the battery for 5 minutes. It should clear the light. If the light comes back on there is something else wrong.
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Old 09-27-2010, 07:29 PM   #12
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First things first ---- you need the codes to know what's wrong. Without knowing whats wrong you can't tell what you are getting yourself into as far as repairs go. Disconnecting the battery will only make the light go off for a short period of time. It WILL NOT fix the problem.
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Old 09-27-2010, 07:51 PM   #13
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Seller has had the codes cleared-replaced cap with a OEM Jeep Cap..the light is off..and he is now driving the 50 miles required to smog the Jeep....

Yep-wish I could have read that code...but I can take off from work and make it to the smog inspect....
rrich-I agree...make the seller perform while I can...in this case its a bit of a circus because she is 9 months pregnant and her boyfriend is doing all the leg work in between work also lol....

Thanks Guys-all good input...great forum-glad you are there with the support ...

Muddyspokes..

Hopefully next question will be..."How do I lift this baby!!!"

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