Code P0121: Throttle Position (TP) Sensor Circuit Range/Performance Problem: Condition
WARNING: This page is about a different car, the 1995 Lexus LS 400. However, it is still accessible from the selected car via links, so may be relevant.
Code is set when ECM consistently detects more than 2 volts from VTA circuit and closed throttle position switch is on. Possible cause is:
- TP sensor malfunction.