P0128 SCION
P0128 SCION - Coolant Thermostat
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Possible causes
- Insufficient warm up time
- Low engine coolant level
- Leaking or stuck open thermostat
- Engine coolant temperature sensor harness is open or shorted
- Engine coolant temperature sensor circuit poor electrical connection
- Faulty engine coolant temperature sensor
- Low engine coolant level
- Leaking or stuck open thermostat
- Engine coolant temperature sensor harness is open or shorted
- Engine coolant temperature sensor circuit poor electrical connection
- Faulty engine coolant temperature sensor
Tech notes
If cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.
When is the code detected?
The engine coolant temperature does not reach to specified temperature even though the engine has run long enough.
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0128 SCION Description
Coolant temperature below thermostat regulating temperature. Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.
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