Coolant Temperature Sensor Function - Monitors engine coolant temperature and provides an accurate signal to the engine control unit (ECU). The ECU uses this data to control fuel delivery, ignition timing, and cooling fan activation, supporting proper engine warm-up and efficient operation. Compatibility - Ford Focus C-Max (DM2) - Ford Focus (DAW, DBW) - Ford Focus Estate (DNW) - Ford Puma Hatchback Benefits - Restores accurate coolant temperature readings when the original sensor has failed - Improves cold-start performance and idle stability - Supports correct engine warm-up and cooling fan operation for better efficiency - Helps prevent incorrect fuel mixture and related drivability issues caused by faulty readings Use scenarios - Replacing a faulty coolant temperature sensor in a Ford Focus C-Max DM2 to fix poor starting and unstable idle - Restoring proper temperature sensing in Ford Focus DAW/DBW to maintain stable idle and steady fuel economy - Servicing Ford Puma Hatchback or Focus Estate DNW as part of routine maintenance or diagnostic work when temperature readings are unreliable Specifications and notes - Size: not specified - Material: not specified - Part type: coolant temperature sensor - The description remains consistent with the listed models and intended function as an OEM-style replacement component