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The status screen allows you to connect to the car and gives information about the readiness of the onboard monitors and the status of the MIL as well as the communication to the car.
Diagnostic Trouble codes
moDiag lets you read and erase the diagnostic trouble codes stored by the vehicle. OBD-2 trouble codes will be translated into plain text. With newer cars (fronm 2010 on) moDiag also reads the so called permanent trouble codes (Mode 0A).
When an emissions related trouble code is stored by the ECU, also a set of parameters will be stored showing the sensor data at the moment the trouble codes was stored. moDiag lets you read out those so called freeze frame data.
O2 sensor test results
On the O2-Sensor tab you can read out the test results of the onboard monitor for the O2 sensors. Note: not all vehicles support this mode! They may report the O2-sensor test results on the next tab!