Coolant Temperature Sensor - Function Measures engine coolant temperature and sends data to the engine control unit to regulate fuel delivery, ignition timing, and cooling fan operation for proper engine warm-up and performance. - Compatibility Opel Corsa D Hatchback (S07) Opel ZAFIRA B (A05) Opel INSIGNIA Caravan Opel Meriva A (X03) - OE numbers 01247070, 12636534, 12641073, 133840, 55353807, 55591401, 012641073, 012656444, 12656444, 55563530, 013338 246, 01338369, 55591002, 01338370, 01338407, 055353807, 055563530, 055591002, 055591401, 06338045, 12470. 70, 70, 138246, 1338369, 1338370 - Why you need this Ensures accurate coolant temperature readings to the engine control unit, enabling reliable cold starts, stable idle, correct fuel mixture, and proper engine warm-up. Helps prevent overheating and improves driveability and efficiency. - Use scenarios 1) Replacing a faulty sensor on a Opel Corsa D to restore accurate temperature readings and smooth idle. 2) Servicing a Opel Zafira B to fix hard starting and fluctuating fuel economy caused by incorrect coolant data. 3) Installing in a Opel Insignia Caravan or Meriva A as part of routine maintenance to ensure dependable engine temperature management. - Additional notes Direct replacement part with compatibility across the listed Opel models and corresponding OE numbers.