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Home >> Lexus >> 2003 >> IS 300 Base, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0121: Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance Fault >> Circuit Description
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Circuit Description

For circuit description, see Circuit Description  under DTC P0120, P0122, P0123, P0220, P0222, P0223 OR P2135. DTC is set when difference between VTA and VTA2 is out of range for 10 seconds when idling, but for 2 seconds when idle is off. Possible cause is a faulty Throttle Position (TP) sensor.