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Home >> Lexus >> 2004 >> IS 300 Base, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control System - Diagnosis >> Circuit Inspection >> DTC P0121: Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance problem >> Inspection Procedure
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Inspection Procedure

HINT:

Read freeze frame date using the hand-held tester or the OBD II scan tool. Freeze frame date records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, It the engine was warmed up or not, if the air-fuel ratio was lean of rich, and other data from time the malfunction occurred.

Replace throttle position sensor (See  THROTTLE BODY  ).