I have a 1999 E36 M3 . every time the weather gets cold check engine light comes one . I toke it to the shop they checked it with auto scanner .
Said fault code P0125
Definition:
Coolant temp is always low
Explanation:
The power train control module verifies that the engine is at a proper operating temperature.
Probable cause:
1- check coolant level
2- thermostat defective
3- ECT engine coolant temperature sensor defective.
Coolant level is good , so they told me I need to change thermostat and ECT sensor ..
PLEASE help me to solve this problem ?????? THANK U