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Engine-Codes.com | All About OBDII Engine Codes

P0128 Mitsubishi

P0128 Mitsubishi - Coolant Thermostat Malfunction

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P0128 Mitsubishi Comments |  Add Comment
Possible causes
- Leaking or stuck open thermostat
- Low engine coolant level
- Insufficient warm up time
- Faulty engine coolant temperature sensor
- Engine coolant temperature sensor harness is open or shorted
- Engine coolant temperature sensor circuit poor electrical connection
Help with Possible causes What does this mean?
Tech notes
If cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.
Help with Tech Notes What does this mean?
When is the code detected?
The engine coolant temperature does not reach to specified temperature even though the engine has run long enough.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0128 Mitsubishi Description

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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