how does obd2 work

 How is OBDII put to use?

The engine control module or power steering control module PCM ECM continuously monitor the Angel four conditions that can cause an increased type pipe emission if the ECM PCM detects a potential problem the engine warning lights call a malfunction indicator light Mia on the dashboard is illuminated to alert the driver of the problem this light is usually identified the word check engine service engine soon or the check the word the check along with an engine symbol the ECM or PCM will also store a diagnostic trouble code DTC in the computer memory DTC can retrieve with a code reader device to help their nose problem with the vehicle with the faults