Roewe 550 1.8 fault code P0340 camshaft phase sensor 1 short circuit to ground or power supply, that is, the camshaft position sensor is broken. In this case, only the sensor can be replaced. The specific operation steps are as follows:

1. Press and hold the sensor plug clip.

2. Pull out the sensor plug.

3. Remove the sensor fixing screw.

4. Unplug the sensor.

5. Reinstall the new sensor in the reverse order.