Code P0121 - Throttle Position Sensor (TPS) Circuit Range/Performance Problem: Condition
WARNING: This page is about a different car, the 1995 Toyota Land Cruiser. 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 causes are:
- Throttle Position Sensor (TPS).