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Unread 03-22-2008, 04:23 PM   #1
99cherokeexj
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check engine light came on, what should i check?

just got back from the badlands and a day of fun, the only carnage is a fender flare. on the way home the light came on, what should i check out before something really goes wrong?

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Unread 03-22-2008, 04:27 PM   #2
xjcowboy01
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It would be nice if something was sounding or acting funny. Keep an eye out for something like that because other wise youll have no idea unless you get one of those scanners to read the codes and find out what it is.
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Unread 03-22-2008, 04:28 PM   #3
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This happened to me recently during an off-road trip. In my case the connector to the rear exhaust sensor had somehow come unplugged and was hanging down below the car, hence the CEL. This might be worth checking as branches or similar might have snagged the wiring underneath?

It took a few engine start/stop cycles before the light cleared.
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Unread 03-22-2008, 04:32 PM   #4
dudeinajp
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gas cap
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Unread 03-22-2008, 04:37 PM   #5
tjwalker
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If you have a check engine light, unless you stumble onto the problem, the best bet is to get the code read so you have some hard data to go on. Use the OBD2 technology on your 99.

Some of the big box parts store (Advance Auto Zone) will plug and read your codes for free in the hopes that you will buy necessary parts from them. Otherwise, any shop can do it and shouldn't charge you much for just reading them.
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Unread 03-22-2008, 05:02 PM   #6
SilverXJ
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Check the codes?
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Unread 03-22-2008, 05:05 PM   #7
AuburnXJ
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gas cap
x2 on the gas cap. Take it off then tighten it like 10 clicks. Then if the check engine light is still on about a day later just go somewhere and get the codes read
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Unread 03-22-2008, 05:21 PM   #8
littleblackXj
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http://go.jeep-xj.info/HowtoECUcodes.htm

Hope this helps.
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Unread 03-22-2008, 07:27 PM   #9
SilverXJ
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That doesn't work on my 2000
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Unread 03-22-2008, 07:46 PM   #10
1996xj
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The CEL comes on because a sensor throws an odd reading or non at all. I have to laugh when ppl check all there fluids but cant figure out why the light is on.

But you prob wont be abke to figure it out unless you pull the code.
Why not just go to autozone or advanced auto and get your codes read for free
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Unread 03-22-2008, 08:54 PM   #11
crateampscal
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get a diagnostics done. 40 bucks
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Unread 03-22-2008, 09:54 PM   #12
itasor
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get a diagnostics done. 40 bucks
Why would you pay $40 to get codes scanned? As mentioned a few times in this thread, most auto parts stores let you use their scanner for free.
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Unread 03-22-2008, 10:47 PM   #13
.45slinger
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If you are going to keep the Jeep, or own more than one vehicle, why not just buy a code reader? You'll probably need it again sometime.

http://www.harborfreight.com/cpi/cta...emnumber=94169
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Unread 03-23-2008, 02:40 PM   #14
AZ Jeff
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Go to the local AutoZone. They will attach an OBD-II scanner to the output port on the bus, and read any codes stored in the ECU that will have triggered the CEL.
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Unread 03-23-2008, 06:22 PM   #15
norsky
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Agree, just go to local auto parts store and get it done for free, no need to pay.
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