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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 198 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0116: Engine Coolant Temperature Circuit Range/Performance Problem Or P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control >> Diagnosis & Repair

Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. If any other DTCs are displayed, diagnose and repair those DTCs first and retest. If only DTC P0116 or P0125 are set, go to next step.
  2. Remove and inspect cooling system thermostat. If problem exists, replace thermostat as necessary and retest. If problem does not exist, replace ECT sensor.
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