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Old 03-13-2012, 01:11 PM   #1
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Check engine light?

So yesterday I bought an '03 Wrangler X, I6 5 speed with only 69,000 miles on it. drove it back 50 miles from the place where I bought it. Went out today and after a quick stop get back in and the check engine light is on. This is confusing because it is running smoothly (as smooth as a Wrangler can) and there isn't anything abnormal about the engine temp or oil pressure. I'm gonna let it cool down and check fluids and disconnect the battery to reset it. Is there anything I should look for if the light comes back on after I disconnect the battery to reset it?

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Old 03-13-2012, 01:16 PM   #2
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Check the codes before you reset, it could be some simple or something serious. Autozone will check it for free. Some others will as well. Best of luck....

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Old 03-13-2012, 01:18 PM   #3
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Turn the key on and off 3 times quickly. The third time leave it in the on position and it should give you a code on the odometer. Take that code and google it or post it here.
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Old 03-13-2012, 01:28 PM   #4
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thanks for the responses guys. After I let it cool a little longer I'm gonna check the fluids atleast and then I will try your trick TX
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Old 03-13-2012, 01:33 PM   #5
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Ok so the code it gave me is P0123
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Old 03-13-2012, 01:55 PM   #6
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Could be a bad TPS (throttle position sensor). I had one go bad on my 02, ran it like that for awhile until it started ideling rough. It's a pretty easy fix.
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Old 03-13-2012, 01:57 PM   #7
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Cool, I'm gonna give it a reset and take it for a drive and see if it comes back. If it does I know what I'm doing tomorrow!
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Old 03-13-2012, 03:57 PM   #8
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Went out for a short 5 mile drive after a reset and the check engine light didn't come back on. I'm guessing it was just some electrical gremlins then.
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Old 03-13-2012, 04:04 PM   #9
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P0123 points to the TPS (if you didn't google that yourself already)

I'd make the dealership aware of your issues. If nothing else, maybe they'll kick in a lil on the price of replacement.
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Old 03-14-2012, 05:51 PM   #10
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So, After about 50 miles of driving between last night and today the CEL came back on and again it was a P0123 code. The second time I started the Jeep after sitting for a little while today the RPMs shot up to 2,000 and then slowly came back down. I'm assuming that this definitely means I need to replace the TPS?
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Old 03-14-2012, 06:20 PM   #11
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Good info for checking your tps function so you don't waste $

http://www.jeepforum.com/forum/f9/ho...c-tps-1113503/
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Old 03-14-2012, 08:46 PM   #12
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Looks like I need to get an Analog meter and check out the voltage at the TPS. Is there anything else I should check? I went out not too long ago and the CEL went out, when I got home I turned the Jeep off, and then turned it back on and the light came back.
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Old 03-14-2012, 11:29 PM   #13
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Quote:
Originally Posted by JeepOnImpulse
Looks like I need to get an Analog meter and check out the voltage at the TPS. Is there anything else I should check? I went out not too long ago and the CEL went out, when I got home I turned the Jeep off, and then turned it back on and the light came back.
If it ends up not being the tps the O2 sensors will go on and off a lot. So it's worth checking. But if your code says tps... I would say tps.
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Old 03-15-2012, 08:14 PM   #14
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So, I've concluded that I have to replace the TPS and that is fine with me, I can handle that one. The engine has been making a whistling sound when I press the accelerator and sometimes while idling. It's near the back of the engine but I can't pinpoint it. Would this spacer attached to the throttle body be the culprit?

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