宝马/圣达菲水温传感器 MEK000030 实时监测冷却液温度，精准反馈

If your vehicle shows cold-start difficulty, rough idle, abnormal fuel consumption, or coolant gauge stays low with fans running at high speed, the coolant temperature sensor is aging and failing. The sensor monitors coolant temperature in real time and sends signals to the ECU to adjust injection and ignition timing for optimal operation. OEM number MEK000030; fits BMW 128i, 135i, 228i, 320i, 323i, 325i, 325xi, 328i, 435i, 528i, etc. Install with engine cold; bleed some coolant, remove the old sensor, clean the hole, apply sealant, and torque to spec to avoid thread damage.