Engine coolant temperature sensor.

DTC P0125 : Check Engine Coolant Level

This DTC indicates ECT sensor has not reached the required temperature level to enter closed loop operating conditions within a specified amount of time after starting engine. Possible causes for this fault are:

Insufficient Engine Warm-Up Time
Thermostat Leaking Or Stuck Open
Malfunctioning CHT Or ECT Sensor
Low Coolant Level

Check and repair cooling system as necessary.

A Cylinder Head Temperature sensor is used instead of an ECT.

. Near water outlet. Follow upper radiator hose as it snakes its way under the intake plenum. Sensor is either located on the water outlet itself (some models) or on the engine block/head near the water outlet.

Easiest (Hmmmph.) Way to access it is to remove the passenger side headlight assembly. The headlight assembly is just a chore to take off; Just when you think you have the easy screws dismounted from the top, there's a "hidden" 10mm bolt behind the moulded bumper which can only be accessed from underneath.

. Enjoy.

Hello - I need to know the exact model and size of your engine in liter. What I have given you is for a Ford Focus LX 2.0L. There are no procedures for this. Disconnect the electrical plug and using a wrench unscrew. Install new one.