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PO121 fault code

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Old 13 Feb 2006, 10:30 pm
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Join Date: Feb 2006
Location: Long Branch, N.J, USA.
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Default PO121 fault code

a couple weeks after installing my AGP wastegate actuator, while driving on the highway sometimes the check engine light comes on and the code PO121 comes up.Throttle position sensor and MAP sensor disagree with each other. Once this happens the car idles at like 3000 rpm's and does not want to idle down when slowing down. After turing the car off and restarting it, it would be perfectly fine. If anybody has any input on what could be causing this, it would be greatly appreciated. I already relpaced the map sensor and the tps and it did nothing.
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Old 14 Feb 2006, 12:02 am
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Join Date: Dec 2002
Posts: 6,787

is there an idle sensor ?? i had a car 86 duster at least i think it was an 86 ?? well anyway, the idle sensor went three times on that car, but it did the same thing your car is doing let us know what you find out good luck !!
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Old 14 Feb 2006, 11:16 am
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Join Date: Nov 2003
Location: Felton, Delaware
Posts: 20,501

P0121 Throttle/Petal Position Sensor/Switch A Circuit Range/Performance Problem

Strange that it clears with a restart....[:I]
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Old 14 Feb 2006, 12:14 pm
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P0121 is throttle position sensor #1 performance . Could be the sensor, power, or pcm. Leave the code and get car to dealer to diagnose ..... there are 3 pages of diags and you need DRBIII to perform most of them.
2004 PT GT -Stage 1, K&N Drop-In, Airbox Mods, \'05 Composite Manifold, AMX TTAB, NGK V-Powers at .040, Magnecore KV-85\'s, Mopar BOV, BTG Strut Bar, Mopar Rear Sway, Drilled/Slotted rotors, Hawk HPS Brake Pads, a few visual Mods, a coupla Road Runners, and a Partridge in a Pear tree......
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