Check Engine Light - P0123

I was just planning to finally join a trail ride, all tire and diff issues cleaned up, and now BlueJ throws me a check engine light. Last weekend the light came on, and shortly after the jeep stalled out while on the road. Using the ignition switch method, I obtained the code "P0123". Here's what I could find on this code:

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P0123 Code - Throttle Position Sensor/Switch A Circuit High Input Technical Description Throttle Position Sensor/Switch A Circuit High Input
What does that mean? A P0123 code means that the the car's computer has detected that the TPS (throttle position sensor) is reporting too high a voltage. Symptoms Symptoms may include:

[li]Rough idle [/li]
[li]High idle [/li]
[li]Surging [/li]
[li]other symptoms may also be present [/li]

Causes A code P0123 may mean that one or more of the following has happened:

[li]TPS not mounted securely [/li]
[li]TPS circuit short to ground or another wire [/li]
[li]Faulty TPS [/li]
[li]Damaged computer (PCM) [/li]

Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, carefully inspect all wiring and connectors that lead to the TPS. More than likely the problem is with the TPS wiring. Check the voltage at the TPS (refer to a service manual for your vehicle for this specific information). If the voltage spikes or is too high (over 4.65 volts with key on, engine off), then that is indicative of a problem. Carefully trace each wire from the TPS wiring harness to check for breaks, rubbing against other components, etc.

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So what does this mean? Was the stall coincidental? I'm not sure if I want to drive it if it will continue stalling (losing power steering).

Any thoughts? I'd love to be able to resolve this issue before the Sept 17 trail ride...

(BTW, the check engince light on my Subaru came back on the same day... but with a different code)

OK, I bought a replacement part, and will try to install it over the weekend. (Where is it located in the 4.0?)

OK, so it took more than 10 minutes, but that was less about the complexity of the job than my mechanical skills. It also took an extra trip to Pep Boys for tools that weren't stripped or defective. So I put on the new TPS... and no good. I went to PB to have then clear the codes, and they couldn't. They said there were multiple codes but only P0123 came down, but they couldn't reset it. And I had the same hesitation and bucking while driving home. So it appears that it wasn't the TPS after all. Any other ideas?

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Disconnect the battery, wait 30 mins and reconnect.

It may run rough or even stall at first, but should relearn it's settings and run OK.

Tried that, light came back on immediately, and while test driving it started to rain for the first time today (my Jeep has been doing that lately). Any other ideas, Keith?

Well, I really don't know if it is aligned correctly. I know that I had to tilt it about 30 degrees for it to slide all the way in, and then I straightened it to slide the bolts in. While driving, the hesitation was pretty subtle and I didn't have any stalls, so if the engine light wasn't on I probably wouldn't have noticed them at all.

Neill came by this afternoon to take a look to see if I put it on backwards or something . His scanner showed the same codes and also wouldn't erase it. We started to take the new one off, and it fell apart in Neill's hands. Maybe the part was defective. We ran over to Pep Boys to exchange it, but they didn't have anymore at that store so we trekked down to Kirkwood Highway. With a new sensor, we tried again. Neill put it on, we tried WD-40 on the connector, disconnected the battery, still no go.

Any OTHER suggestions?