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Home >> Lexus >> 2014 >> IS 350 Base, AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (2GR-FSE) - Diagnostic Codes (2 Of 6) >> SFI System >> DTC P0128: Thermostat [06/2014 - 10/2017] >> Typical Malfunction Thresholds

Typical Malfunction Thresholds

Duration that all of the following conditions are met 5 seconds or more
Estimated engine coolant temperature 75°C (167°F) or higher
Engine coolant temperature sensor output Less than 75°C (167°F)
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