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Old 09-07-2010, 11:54 PM   #1
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Light rain & TPS

For about 2 weeks, it's been slightly rainy here in Fairbanks. The TJ's check engine light (CEL) came on during a drizzly morning (code P0123 only). Jeep seems to run fine. Two days later the CEL went out on its own. I then coated most electrical connections with dielectric grease. The CEL came back on during the next drizzly morning and cleared itself a couple days later. The jeep has a hardtop with a couple of small water leaks behind the drivers seats, but nothing near the clockspring. Now, it's starting to get chilly here in Alaska and I'd rather get this taken cate of sooner rather than later. Any thoughts?

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Old 09-08-2010, 05:01 AM   #2
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Just replace the TPS. It's a cheap part you can get from any parts store.

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Old 09-08-2010, 11:29 PM   #3
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Really? I thought that the association with light rain meant differently.
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Old 09-09-2010, 01:56 AM   #4
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While it could be something else... it also could be the humidity level during the rain (rain = higher humidity levels all around) causing the sensor to act up.

So...replacing it may not fix your problem, but it also could. I'd check your wiring from the TPS sensor and if it all checks out, I'd take the risk and just replace the sensor. Get an OEM sensor though... parts house TPS sensors can be a bit quirky. Some of them "work" but aren't working PROPERLY.
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Old 09-09-2010, 06:14 AM   #5
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Where does it comer from that parts store TPS units do not work? I have two Chrysler vehicles (03 TJ, 99 Durango) and are on a number of forums for both. TPS issues are very common on the Durango/Dakota/Ram and that is with the original OEM TPS. Myself and many others over the years have replace the Chrysler OEM TPS units with parts store replacements without any issues. My Durango one I replaced 8 years ago. I have had the TJ for 3 years now. I started getting a 0122 code for the TPS and replaced it 2 years ago with a unit from Pep Boys. No issues.
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Old 09-09-2010, 12:08 PM   #6
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I have seen the OEM TPS recommendation from a lot of different people that seem a lot more knowledgeable than myself. I was trying to figure out my TPS issue in high humidity and did a bunch of WF searches, but I didn't really come up with a good answer. I'll buy an OEM TPS and see if it fixes the problem... I'll follow up with a conclusive answer after I get it purchased.

Thanks!

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