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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 223 (Engine Control System (A25A-FXS) - Diagnostic Codes (05 Of 20)) >> SFI System >> DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature); DTC P0128-07: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) Mechanical Failure [08/2021 - ] >> Monitor Strategy

Monitor Strategy

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
Related DTCs P0128: Coolant thermostat (judgment by simulated engine coolant temperature)
P0128: Coolant thermostat (judgment by engine coolant temperature and No. 2 engine coolant temperature changes)
Required Sensors/Components (Main) Thermostat
Engine coolant temperature sensor
Required Sensors/Components (Related) Intake air temperature sensor
No. 2 engine coolant temperature sensor
Frequency of Operation Once per driving cycle
Duration 80 seconds: Judgment by simulated engine coolant temperature
-: Judgment by engine coolant temperature and No. 2 engine coolant temperature changes
MIL Operation 2 driving cycles
Sequence of Operation None
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