Faulty Engine Coolant Temperature Sensor
Engine Coolant Temperature Sensor harness is open or shorted
Engine Coolant Temperature Sensor circuit poor electrical connection
Faulty Instrument Panel
Engine Light ON (or Service Engine Soon Warning Light)
Instrument Panel Engine Coolant Temperature Signal Open Circuit / Short To Positive is the generic description for the P1620 Audi code, but the manufacturer may have a different description for your model and year vehicle. Currently, we have no further information
about the P1620 Audi OBDII code.