SOURCE: Escort check engine light - code = P0125
Sounds as if the car is not getting warm enough, which could mean that your thermostat is stuck in the open position. Try changing it. That should take care of the problem. Depending on which brand you get, the thermostat will most likely cost you between $8.00-$16.00.
Also, check the coolant level. Make sure its at a proper level. The Temperature Sensor could be bad as well.
SOURCE: insufficient coolant temperature for closed
A code P0125 may mean that one or more of the following has happened:
The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is likely going to be the result of the
above causes (faulty thermostat, faulty ECT sensor, or a low coolant level) theres your answer need more help just tell me
It is not causing any damage and will likely not leave you stranded however it will be hitting you in the pocket book.
A cooler running engine will require more fuel to keep running. Also if the engine temp does not get up to full operating temp the PCM may not enter closed loop which mean it will be running on preprogrammed conditions rather than on sensor data which will also use more fuel and may cause some performance issues.
A new thermostat is the normal fix for this problem. $10-$20 for a stat and an hour to replace with basic hand tools and you should be good to go.
If your not a do it yourselfer you should be able to get this done for under a couple hundred dollars maybe a little more if you need a coolant flush.
Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!
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