October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Code P0121: Throttle Position (TP) Sensor Circuit Range/Performance Problem: Condition

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.