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  #1  
Old 11-20-2011, 12:41 PM
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Question Help with TPS replacement (P0123/0121)

Just got the nasty P0123/P0121 codes. And based on what the car is acting like (possessed!), I'd say its a safe bet.

Does someone have a diagram of where the TPS is and simple but detailed instructions on how to replace it? I'd rather do it myself than pay a mechanic.

Any help and detailed instructions are appreciated!
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Old 11-20-2011, 01:45 PM
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Re: Help with TPS replacement (P0123/0121)

Here you go girl. tps.pdf
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Old 11-20-2011, 04:14 PM
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Re: Help with TPS replacement (P0123/0121)

Very easy to do yourself, just one connector and 2 Torqx screws.
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Old 11-20-2011, 05:02 PM
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Re: Help with TPS replacement (P0123/0121)

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Originally Posted by cheapjeep View Post
Here you go girl. Attachment 10563
Thanks! Still diggin your Jeep!
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Old 11-21-2011, 09:59 AM
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Re: Help with TPS replacement (P0123/0121)

Very easy to replace the TPS yourself, I grabbed some tools and did it in my mother in laws driveway. Just follow the manual that Dave posted and you will have no problems. Also, while you are there, I would buy a can of throttle body cleaner and pull off the idle air controller (IAC on the diagrams) and clean the plunger. Just make sure not to twist it when doing so. Also, wipe off any buildup from the throttle body and plate with a rag and the cleaner. This will help keep a smooth idle and throttle response.
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Old 11-21-2011, 07:03 PM
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Re: Help with TPS replacement (P0123/0121)

How the heck does the electrical connector come off?????
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Old 11-21-2011, 07:37 PM
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Re: Help with TPS replacement (P0123/0121)

There is a small tab on the lower side of the connector which you have to squeeze to unlock it and then you pull at the same time.
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Old 11-21-2011, 08:26 PM
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Re: Help with TPS replacement (P0123/0121)

Quote:
Originally Posted by Frango100 View Post
There is a small tab on the lower side of the connector which you have to squeeze to unlock it and then you pull at the same time.
Yep, got it. Wow was it a %%&@@. But new TPS is in, reset the codes and all is well. Thanks everyone!

Makes me want a FIPK!
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Old 01-06-2014, 08:31 PM
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Re: Help with TPS replacement (P0123/0121)

I also have a P0121 code.. Questions.. where do you recommend purchasing the TPS?? and looking at Dave's diagram, are there any adjustments that I should be aware of?? Such as the shaft or tangs?
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Old 01-07-2014, 06:40 AM
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Re: Help with TPS replacement (P0123/0121)

Some have no good experiences with aftermarket, but im running one from Rockauto.com without issues.
Removal/installation is straight forward and no adjustments possible. Just remove the connector, and remove both Torq-x screws. The TPS will rotate a bit and then you can pull it straight out. Check if the old TPS has a gasket or Oring and put the same on the new TPS. Now install it the same way the old one came out and then turn it a bit (against some weak spring pressure) until the screw holes align and put the screws in. Connect the connector and enjoy your jeep.
Eventhough the manual calls for removing the resonator box for better access, you can easily do the job with the resonator box in place (and save some time). If you decide to do the throttle body cleaning at the same time, you will have to remove the resonator box.
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Old 02-18-2014, 07:10 PM
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I'm not sure if my TPS is starting to go or not but whenever I'm at a stop, with foot on brake, my WJ(04 GC Overland 4.7L HO) will sometimes idle between 500-800 RPMs and it almost stalled a few times this week. Just coming home tonight it dipped below 500 and shot up to almost 1000. No codes or engine light yet either.
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Old 02-18-2014, 09:50 PM
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Re: Help with TPS replacement (P0123/0121)

I would start with a throttle body cleaning and especially the Idle Air Control stepper motor. The plunjer and idle air canal gets very dirty over time and causes unstable idle. See here for some pictures: Lopey idle on an 02' Overland / 4.7HO
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