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Home >> Lexus >> 2021 >> RC F Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (2 Of 9) >> SFI System >> DTC P0128: Thermostat [09/2014 - 10/2015] >> Description

DTC P0128: Thermostat [09/2014 - 10/2015]: Description

This DTC is stored when the engine coolant temperature does not reach 75°C (167°F) despite sufficient engine warm-up time having elapsed.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0128 Thermostat All of the following conditions are met for 5 seconds (2 trip detection logic):
(a) Cold start
(b) The engine is warmed up
(c) The engine coolant temperature is less than 75°C (167°F)
  • Water inlet with thermostat sub-assembly
  • Cooling system
  • Engine coolant temperature sensor
  • ECM
Comes on DTC stored