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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0128: Thermostat Malfunction >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

Thermostat range is 176-183°F (80-83°C). If water temperature exceeds thermostat rating, code will set. Problem could be due to thermostat, cooling system, engine coolant temperature sensor, or ECM.

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