What is Code P0120
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The "TPS Performance" code is set when the TPS has an erratic output and/or the PCM thinks the TPS output should be something other than what it is...i.e motor is running 6000 rpm and the TPS is saying 10%. I'd be willing to bet you've got a sensor on its way out. I'll have to double check it in my service manual to see for sure what the criteria is for setting the code.