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Home › Infiniti › 2006 › QX56 AWD › Repair and Diagnosis › Engine Performance › System › Engine Control System - DTCS U1000 To P0159 › DTC P0128 Thermostat Function › DTC Confirmation Procedure › Testing Condition:

Testing Condition:

For best results, perform at ambient temperature of -10°C (14°F) or higher.
For best results, perform at engine coolant temperature of -10°C (14°F) to 60°C (140°F).