A4 Why does the engine shake after changing the thermostat?

This is the sensor under the water tank, which is broken! Therefore, the engine computer is modified to the default value. At this time, the starting condition of the fan only depends on the water temperature sensor on the tee joint behind the cylinder head, that is, the water temperature on the instrument panel. This is why the cold fan of the water tank turns early! In addition, the third group of 5053 readings, the measured engine unit 13 1 channel, is the outlet temperature of the radiator, and the first group is the temperature displayed on the engine dashboard.