Some 2008-2009 Lexus vehicles equipped with the 2GR-FE or 4GR-FE engine may exhibit a MIL “ON” condition with one or both of the following codes:
P0128 (Coolant Thermostat belowThermostat Regulating Temperature)
P0116 (Engine Coolant Temperature Range/Performance Problem)
This TSB applies to vehicles produced before the Production Change Effective VINs shown below:
MODEL PLANT DRIVETRAIN PROD. CHANGE EFF. VIN
GS 350 Tahara 2WD JTHBE96S*90045581
GS 350 Tahara 4WD JTHCE96S*90023172
GS450h Tahara 2WD JTHBC96S*95019778
GS450h Tahara 4WD JTHCK262*95033047
IS 250 Tahara 2WD JTHBK262*05099794
IS 250 Tahara 4WD JTHCK262*95033047
IS 250 TMK 4WD JTHCK262*92032298
IS 250 TMK 2WD JTHBK262*92094026
IS 350 Tahara 2WD JTHBE262*95023043
IS 350 TMK 2WD JTHBE262*92017385
REPAIR PROCEDURE
- Using Techstream, check for any stored DTCs.
- If DTCs P0128 and/or P0116 are present, remove and inspect the thermostat housing and thermostat.
- If the thermostat is not securely seated in the thermostat housing, replace the thermostat and the thermostat housing.