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Old 04-19-2009, 09:41 PM   #1
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Default Trouble Code 121

i ran codes on my 1995 f150 and go a 121 code i found that this code means closed throttle voltage higher or lower than expected, any ideas and what code be wrong

Last edited by tito2009; 04-19-2009 at 10:13 PM.
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Old 04-19-2009, 10:27 PM   #2
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Likely an issue with the TPS sensor on the bottom of the throttle body. Could be a few other things, which you might try first - I would try cleaning the throttle body with throttle body cleaner, and what's the idle rpm? A previous owner could have adjusted the throttle stop and gotten things screwed up.
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Old 04-19-2009, 10:37 PM   #3
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its ideling at right under 1000 rpms
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Old 04-19-2009, 10:39 PM   #4
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Hmmm... that's probably about right - does it drop to 600-700 in gear?

Either way - I'd predict a TPS replacement in your future.
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Old 04-19-2009, 11:06 PM   #5
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i will try cleaning the throttle body and run codes again, if that doesnt work i will have to invest in the TPS sensor and change it. thanks for your help
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Old 04-20-2009, 01:35 PM   #6
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how hard is it to change the TPS sensor 1995 f150 5.0. i see two screw under the throttle body but there is very little room to work. any suggestions
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Old 04-20-2009, 01:49 PM   #7
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i know your trucks a 95 but this is the how to on checking the tps voltage.
for a newer model. this might help you tho.
i'm pretty sure you just disconnect the wires and undo the 2 screws and put the new one in place. then follow the instructions for adjusting the new tps
http://www.f150online.com/forums/lig...ttle-body.html
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Old 04-20-2009, 03:18 PM   #8
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You have to remove the throttle body to get the TPS off.
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Old 04-20-2009, 05:34 PM   #9
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Yeah I have some pictures posted on my profile if you wana look how i did mine, not sure if they are different. Its pretty straight forward after you remove everything.
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Old 04-20-2009, 08:54 PM   #10
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thank you the pictures helped. i will get to it tomorrow and take care of it
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Old 04-20-2009, 08:54 PM
 
 
 
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