FixVault

DTC P1121: TP Sensor Signal Lower Than Expected

  1. Turn the ignition switch ON (II).
  2. Check the throttle position with the scan tool or the HDS.

    Is 16.1%, 0.8 V, or higher indicated when the throttle is fully opened? 

    1. YES  -Intermittent failure, system is OK at this time.
    2. NO  -Replace the throttle body.