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GS 350 AWD
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Section 158 (Engine Control (SFI) (2GR-FSE) System (DTCS P0010 - P0354))
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SFI System
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DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
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Typical Malfunction Thresholds
Typical Malfunction Thresholds
WARNING:
This page is about a different car, the 2009 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.
Duration that both following conditions 1 and 2 are met:
5 seconds or more
1. Estimated ECT
75°C (167°F) or more
2. ECT sensor output
Less than 75°C (167°F)