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OBD II Fault Code
- OBD II P0128
Fault Code Definition
- Engine temperature has not increased and/or reached the correct level within a specified amount of time after engine startup
Symptoms
- http://wiki.answers.com/check-engine-lighton
- Vehicle may not shift into the highest gear at freeway speed
- Decrease in fuel economy
- In unusual cases, there are no adverse conditions noticed by the driver
Common Problems That Trigger the P0128 Code
- Defective Engine http://wiki.answers.com/thermostat
- Defective Engine http://wiki.answers.com/engine-coolant-temperature-sensor
- Defective Intake Air Temperature Sensor
- Defective http://wiki.answers.com/cooling-system
- Low http://wiki.answers.com/coolant
- Dirty Engine Coolant, causing incorrect Coolant Temperature Sensor readings
- Defective, always running http://wiki.answers.com/engine-cooling-fan
Common Misdiagnoses
- Engine http://wiki.answers.com/cooling-fan-operation
- Internal http://wiki.answers.com/engineproblem
- http://wiki.answers.com/oxygen-sensorproblem
- Engine Coolant Temperature Sensor problem
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