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Home >> Toyota >> 2018 >> Highlander LE Plus, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 43 (SFI System [1AR-FE] - Diagnostic Codes - (Except Hybrid) (8 Of 8)) >> SFI System >> DTC P0128: Thermostat [08/2014 - 11/2016] >> Typical Malfunction Thresholds

Typical Malfunction Thresholds

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Duration that both 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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