Q: P0128 - Coolant Thermostat had a fault 2007 Nissan Sentra

asked by on

I have 2007 Nissan Sentra 2.0 which has engine light on Error Code - "P0128 indicates that the coolant thermostat had a fault (Coolant Temp below Thermostat regulating temperature) for a predetermined period of time." Autozone just looked in the system and suggested for a Sensor replacement. I also took this to another service place. They said to take it to Dealer and it could be because the transponder key is not functioning correctly which can be programmed only by dealer. Both of them completely out of sync.

Symptoms - Heater takes at least 10 minutes to start giving hot air. Fan working perfectly fine at different speed levels. Any suggestions - Do I need to replace thermostat or sensor or anything else I should diagnose? Any suggestion? Thank You!

My car has 117000 miles.
My car has an automatic transmission.

Hello - your thermostat is not functioning properly, and should be replaced. The problem code is indicating that the engine temperature is not coming up as quickly as it should - which the thermostat controls. You have noticed this in how long it takes the heater to be functional. I would recommend a thermostat replacement](https://www.yourmechanic.com/services/thermostat-replacement) by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, and correct this problem.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. P0128 - Coolant Thermostat had a fault 2007 Nissan Sentra

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Q: Car leaking transmission fluid

Transmission leaks can become very expensive if not addressed quickly. The fluid acts as a lubricant and cooling fluid, so if it's missing, heat in the form of friction can cause catastrophic failure. Possible points of leakage include the transmission...

Q: Clutch slave cylinder causes clutch pedal malfunction

Hi there, thanks for writing in about your 2012 Nissan 370Z. The clutch assembly shouldn't be worn out at 50,000 miles unless the vehicle has been abused. There are many concerns for vehicles that match your model year with the...

Q: Car hard to start and vibrates

This almost sounds like there is some mechanical resistance loading down the engine, making it hard to start, and hard to run. Generally, the best way to determine this is to disconnect the drive belt to the rotating engine peripherals,...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...