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P0120 Diagnostic Trouble Code Discussion for May 2012

Throttle Position Sensor Circuit Malfunction

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Trouble Ticket Help Requests for DTC P0120
Help Request Posted
1997 Toyota Corolla 1.6L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 2T1BA02EXV
P0120: TP Sensor or Switch 'A' Circuit Malfunction. ... not idle,when i got it the o2 sensor was unhooked,blowing black smoke out the tail pipe and it would not idle.we put spark plugs ,distribtor cap and rotor button,oil was full of gas so we changed oil.then it would idle but sill blowing black smoke out the ...
May 16, 2012